31312212004156 has 6 divisors (see below), whose sum is σ = 54796371007280. Its totient is φ = 15656106002076.

The previous prime is 31312212004153. The next prime is 31312212004159. The reversal of 31312212004156 is 65140021221313.

It is an interprime number because it is at equal distance from previous prime (31312212004153) and next prime (31312212004159).

It is a super-2 number, since 2×31312212004156² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31312212004153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3914026500516 + ... + 3914026500523.

Almost surely, 2^{31312212004156} is an apocalyptic number.

It is an amenable number.

31312212004156 is a deficient number, since it is larger than the sum of its proper divisors (23484159003124).

31312212004156 is a wasteful number, since it uses less digits than its factorization.

31312212004156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7828053001043 (or 7828053001041 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 31312212004156 its reverse (65140021221313), we get a palindrome (96452233225469).

The spelling of 31312212004156 in words is "thirty-one trillion, three hundred twelve billion, two hundred twelve million, four thousand, one hundred fifty-six".