147387655921 has 27 divisors (see below), whose sum is σ = 172178733153. Its totient is φ = 126045659520.

The previous prime is 147387655897. The next prime is 147387655973. The reversal of 147387655921 is 129556783741.

The square root of 147387655921 is 383911.

It is a perfect power (a square), and thus also a powerful number.

147387655921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 13855879521 + 133531776400 = 117711^2 + 365420^2 .

It is not a de Polignac number, because 147387655921 - 2²¹ = 147385558769 is a prime.

It is a super-2 number, since 2×147387655921² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (147387655981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 71790331 + ... + 71792383.

Almost surely, 2^147387655921 is an apocalyptic number.

147387655921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

147387655921 is the 383911-st square number.

147387655921 is the 191956-th centered octagonal number.

It is an amenable number.

147387655921 is a deficient number, since it is larger than the sum of its proper divisors (24791077232).

147387655921 is an frugal number, since it uses more digits than its factorization.

147387655921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4162 (or 2081 counting only the distinct ones).

The product of its digits is 12700800, while the sum is 58.

It can be divided in two parts, 147387 and 655921, that added together give a palindrome (803308).

The spelling of 147387655921 in words is "one hundred forty-seven billion, three hundred eighty-seven million, six hundred fifty-five thousand, nine hundred twenty-one".