31123012019 has 16 divisors (see below), whose sum is σ = 36072436320. Its totient is φ = 26579669760.

The previous prime is 31123011991. The next prime is 31123012031. The reversal of 31123012019 is 91021032113.

It is a cyclic number.

It is not a de Polignac number, because 31123012019 - 2²⁸ = 30854576563 is a prime.

It is a super-2 number, since 2×31123012019² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31123011985 and 31123012003.

It is not an unprimeable number, because it can be changed into a prime (31123012099) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1306634 + ... + 1330239.

It is an arithmetic number, because the mean of its divisors is an integer number (2254527270).

Almost surely, 2^31123012019 is an apocalyptic number.

31123012019 is a deficient number, since it is larger than the sum of its proper divisors (4949424301).

31123012019 is a wasteful number, since it uses less digits than its factorization.

31123012019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2636950.

The product of its (nonzero) digits is 324, while the sum is 23.

The spelling of 31123012019 in words is "thirty-one billion, one hundred twenty-three million, twelve thousand, nineteen".