31577223681 has 32 divisors (see below), whose sum is σ = 47927738880. Its totient is φ = 20538321408.

The previous prime is 31577223673. The next prime is 31577223703. The reversal of 31577223681 is 18632277513.

It is not a de Polignac number, because 31577223681 - 2³ = 31577223673 is a prime.

It is a super-2 number, since 2×31577223681² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31577223281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 363025 + ... + 441521.

It is an arithmetic number, because the mean of its divisors is an integer number (1497741840).

Almost surely, 2^31577223681 is an apocalyptic number.

It is an amenable number.

31577223681 is a deficient number, since it is larger than the sum of its proper divisors (16350515199).

31577223681 is a wasteful number, since it uses less digits than its factorization.

31577223681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78870 (or 78864 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The spelling of 31577223681 in words is "thirty-one billion, five hundred seventy-seven million, two hundred twenty-three thousand, six hundred eighty-one".