31000640231 has 8 divisors (see below), whose sum is σ = 33820356864. Its totient is φ = 28181169720.

The previous prime is 31000640221. The next prime is 31000640249. The reversal of 31000640231 is 13204600013.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-31000640231 is a prime.

It is a super-2 number, since 2×31000640231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31000640201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288386 + ... + 381008.

It is an arithmetic number, because the mean of its divisors is an integer number (4227544608).

Almost surely, 2^31000640231 is an apocalyptic number.

31000640231 is a deficient number, since it is larger than the sum of its proper divisors (2819716633).

31000640231 is a wasteful number, since it uses less digits than its factorization.

31000640231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123061.

The product of its (nonzero) digits is 432, while the sum is 20.

The spelling of 31000640231 in words is "thirty-one billion, six hundred forty thousand, two hundred thirty-one".