31006621952881 has 3 divisors (see below), whose sum is σ = 31006627521241. Its totient is φ = 31006616384522.

The previous prime is 31006621952843. The next prime is 31006621952899. The reversal of 31006621952881 is 18825912660013.

It is a happy number.

The square root of 31006621952881 is 5568359.

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 not a de Polignac number, because 31006621952881 - 2³¹ = 31004474469233 is a prime.

It is a super-2 number, since 2×31006621952881² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31006621952081) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2784180 + ... + 8352538.

Almost surely, 2^{31006621952881} is an apocalyptic number.

31006621952881 is the 5568359-th square number.

31006621952881 is the 2784180-th centered octagonal number.

It is an amenable number.

31006621952881 is a deficient number, since it is larger than the sum of its proper divisors (5568360).

31006621952881 is an frugal number, since it uses more digits than its factorization.

31006621952881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11136718 (or 5568359 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 52.

The spelling of 31006621952881 in words is "thirty-one trillion, six billion, six hundred twenty-one million, nine hundred fifty-two thousand, eight hundred eighty-one".