172149478281 has 105 divisors (see below), whose sum is σ = 286168150605. Its totient is φ = 103511497320.

The previous prime is 172149478271. The next prime is 172149478301. The reversal of 172149478281 is 182874941271.

The square root of 172149478281 is 414909.

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

172149478281 is a `hidden beast` number, since 1 + 7 + 2 + 1 + 494 + 78 + 2 + 81 = 666.

It is not a de Polignac number, because 172149478281 - 2²⁷ = 172015260553 is a prime.

It is a super-2 number, since 2×172149478281² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172149478261) by changing a digit.

It is a polite number, since it can be written in 104 ways as a sum of consecutive naturals, for example, 1355507640 + ... + 1355507766.

Almost surely, 2^172149478281 is an apocalyptic number.

172149478281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

172149478281 is the 414909-th square number.

172149478281 is the 207455-th centered octagonal number.

It is an amenable number.

172149478281 is a deficient number, since it is larger than the sum of its proper divisors (114018672324).

172149478281 is an frugal number, since it uses more digits than its factorization.

172149478281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316 (or 141 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 54.

The spelling of 172149478281 in words is "one hundred seventy-two billion, one hundred forty-nine million, four hundred seventy-eight thousand, two hundred eighty-one".