31311220104 has 48 divisors (see below), whose sum is σ = 87093153420. Its totient is φ = 10154989440.

The previous prime is 31311220099. The next prime is 31311220117. The reversal of 31311220104 is 40102211313.

31311220104 is a `hidden beast` number, since 31 + 311 + 220 + 104 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 31258947204 + 52272900 = 176802^2 + 7230^2 .

It is a super-2 number, since 2×31311220104² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5874067 + ... + 5879394.

Almost surely, 2^31311220104 is an apocalyptic number.

It is an amenable number.

31311220104 is an abundant number, since it is smaller than the sum of its proper divisors (55781933316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31311220104 is a wasteful number, since it uses less digits than its factorization.

31311220104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11753510 (or 11753503 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31311220104 its reverse (40102211313), we get a palindrome (71413431417).

The spelling of 31311220104 in words is "thirty-one billion, three hundred eleven million, two hundred twenty thousand, one hundred four".