31011022231 has 16 divisors (see below), whose sum is σ = 36618490368. Its totient is φ = 25712013600.

The previous prime is 31011022223. The next prime is 31011022247. The reversal of 31011022231 is 13222011013.

It is not a de Polignac number, because 31011022231 - 2³ = 31011022223 is a prime.

It is a super-2 number, since 2×31011022231² (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 (31011022261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 562305 + ... + 614986.

It is an arithmetic number, because the mean of its divisors is an integer number (2288655648).

Almost surely, 2^31011022231 is an apocalyptic number.

31011022231 is a deficient number, since it is larger than the sum of its proper divisors (5607468137).

31011022231 is a wasteful number, since it uses less digits than its factorization.

31011022231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177422.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31011022231 its reverse (13222011013), we get a palindrome (44233033244).

The spelling of 31011022231 in words is "thirty-one billion, eleven million, twenty-two thousand, two hundred thirty-one".