31213023219 has 64 divisors (see below), whose sum is σ = 54064558080. Its totient is φ = 17426551680.

The previous prime is 31213023203. The next prime is 31213023221. The reversal of 31213023219 is 91232031213.

31213023219 is a `hidden beast` number, since 31 + 2 + 1 + 302 + 321 + 9 = 666.

It is not a de Polignac number, because 31213023219 - 2⁴ = 31213023203 is a prime.

It is a super-2 number, since 2×31213023219² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 31213023192 and 31213023201.

It is not an unprimeable number, because it can be changed into a prime (31213023229) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5797909 + ... + 5803289.

It is an arithmetic number, because the mean of its divisors is an integer number (844758720).

Almost surely, 2^31213023219 is an apocalyptic number.

31213023219 is a deficient number, since it is larger than the sum of its proper divisors (22851534861).

31213023219 is a wasteful number, since it uses less digits than its factorization.

31213023219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6097 (or 6091 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The spelling of 31213023219 in words is "thirty-one billion, two hundred thirteen million, twenty-three thousand, two hundred nineteen".