309368451681 has 45 divisors (see below), whose sum is σ = 483289647841. Its totient is φ = 197205013368.

The previous prime is 309368451671. The next prime is 309368451737. The reversal of 309368451681 is 186154863903.

The square root of 309368451681 is 556209.

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

309368451681 is a `hidden beast` number, since 30 + 93 + 6 + 8 + 4 + 516 + 8 + 1 = 666.

It is not a de Polignac number, because 309368451681 - 2²⁹ = 308831580769 is a prime.

It is a super-2 number, since 2×309368451681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (309368451671) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 115133920 + ... + 115136606.

Almost surely, 2^309368451681 is an apocalyptic number.

309368451681 is the 556209-th square number.

309368451681 is the 278105-th centered octagonal number.

It is an amenable number.

309368451681 is a deficient number, since it is larger than the sum of its proper divisors (173921196160).

309368451681 is an frugal number, since it uses more digits than its factorization.

309368451681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5432 (or 2713 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The spelling of 309368451681 in words is "three hundred nine billion, three hundred sixty-eight million, four hundred fifty-one thousand, six hundred eighty-one".