155449621441 has 3 divisors (see below), whose sum is σ = 155450015713. Its totient is φ = 155449227170.

The previous prime is 155449621363. The next prime is 155449621447. The reversal of 155449621441 is 144126944551.

The square root of 155449621441 is 394271.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a de Polignac number, because none of the positive numbers 2^k-155449621441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155449621391 and 155449621400.

It is not an unprimeable number, because it can be changed into a prime (155449621447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 197136 + ... + 591406.

Almost surely, 2^155449621441 is an apocalyptic number.

155449621441 is the 394271-st square number.

155449621441 is the 197136-th centered octagonal number.

It is an amenable number.

155449621441 is a deficient number, since it is larger than the sum of its proper divisors (394272).

155449621441 is an frugal number, since it uses more digits than its factorization.

155449621441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788542 (or 394271 counting only the distinct ones).

The product of its digits is 691200, while the sum is 46.

The spelling of 155449621441 in words is "one hundred fifty-five billion, four hundred forty-nine million, six hundred twenty-one thousand, four hundred forty-one".