31105812 has 24 divisors (see below), whose sum is σ = 76400800. Its totient is φ = 9822816.

The previous prime is 31105783. The next prime is 31105817. The reversal of 31105812 is 21850113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31105817) 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, 67987 + ... + 68442.

Almost surely, 2^31105812 is an apocalyptic number.

It is an amenable number.

31105812 is an abundant number, since it is smaller than the sum of its proper divisors (45294988).

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

31105812 is a wasteful number, since it uses less digits than its factorization.

31105812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136455 (or 136453 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 31105812 is about 5577.2584663076. The cubic root of 31105812 is about 314.4950741610.

Adding to 31105812 its reverse (21850113), we get a palindrome (52955925).

The spelling of 31105812 in words is "thirty-one million, one hundred five thousand, eight hundred twelve".