308998705132881 has 15 divisors (see below), whose sum is σ = 461590894616313. Its totient is φ = 205999031285100.

The previous prime is 308998705132841. The next prime is 308998705132883. The reversal of 308998705132881 is 188231507899803.

The square root of 308998705132881 is 17578359.

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

308998705132881 is a `hidden beast` number, since 3 + 0 + 8 + 9 + 9 + 8 + 7 + 0 + 513 + 28 + 81 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-308998705132881 is a prime.

It is a super-2 number, since 2×308998705132881² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (308998705132883) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 157228656 + ... + 159181806.

Almost surely, 2^{308998705132881} is an apocalyptic number.

308998705132881 is the 17578359-th square number.

308998705132881 is the 8789180-th centered octagonal number.

It is an amenable number.

308998705132881 is a deficient number, since it is larger than the sum of its proper divisors (152592189483432).

308998705132881 is an frugal number, since it uses more digits than its factorization.

308998705132881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3906314 (or 1953154 counting only the distinct ones).

The product of its (nonzero) digits is 209018880, while the sum is 72.

The spelling of 308998705132881 in words is "three hundred eight trillion, nine hundred ninety-eight billion, seven hundred five million, one hundred thirty-two thousand, eight hundred eighty-one".