31856462818 has 16 divisors (see below), whose sum is σ = 49027829760. Its totient is φ = 15515085600.

The previous prime is 31856462789. The next prime is 31856462819. The reversal of 31856462818 is 81826465813.

It is a happy number.

It is a super-2 number, since 2×31856462818² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31856462819) 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 7 ways as a sum of consecutive naturals, for example, 256098 + ... + 359581.

It is an arithmetic number, because the mean of its divisors is an integer number (3064239360).

Almost surely, 2^31856462818 is an apocalyptic number.

31856462818 is a deficient number, since it is larger than the sum of its proper divisors (17171366942).

31856462818 is a wasteful number, since it uses less digits than its factorization.

31856462818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616353.

The product of its digits is 2211840, while the sum is 52.

The spelling of 31856462818 in words is "thirty-one billion, eight hundred fifty-six million, four hundred sixty-two thousand, eight hundred eighteen".