63171292921 has 27 divisors (see below), whose sum is σ = 70626065517. Its totient is φ = 56460792960.

The previous prime is 63171292913. The next prime is 63171292931. The reversal of 63171292921 is 12929217136.

The square root of 63171292921 is 251339.

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

It can be written as a sum of positive squares in 4 ways, for example, as 22383451321 + 40787841600 = 149611^2 + 201960^2 .

It is not a de Polignac number, because 63171292921 - 2³ = 63171292913 is a prime.

It is a super-2 number, since 2×63171292921² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63171292931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 201825061 + ... + 201825373.

Almost surely, 2^63171292921 is an apocalyptic number.

63171292921 is the 251339-th square number.

63171292921 is the 125670-th centered octagonal number.

It is an amenable number.

63171292921 is a deficient number, since it is larger than the sum of its proper divisors (7454772596).

63171292921 is an frugal number, since it uses more digits than its factorization.

63171292921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794 (or 397 counting only the distinct ones).

The product of its digits is 81648, while the sum is 43.

The spelling of 63171292921 in words is "sixty-three billion, one hundred seventy-one million, two hundred ninety-two thousand, nine hundred twenty-one".