18031795731 has 24 divisors (see below), whose sum is σ = 26450994960. Its totient is φ = 11835576000.

The previous prime is 18031795729. The next prime is 18031795759. The reversal of 18031795731 is 13759713081.

18031795731 is a `hidden beast` number, since 1 + 8 + 0 + 3 + 1 + 79 + 573 + 1 = 666.

It is not a de Polignac number, because 18031795731 - 2¹ = 18031795729 is a prime.

It is a super-2 number, since 2×18031795731² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18031795721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107301 + ... + 218121.

It is an arithmetic number, because the mean of its divisors is an integer number (1102124790).

Almost surely, 2^18031795731 is an apocalyptic number.

18031795731 is a deficient number, since it is larger than the sum of its proper divisors (8419199229).

18031795731 is a wasteful number, since it uses less digits than its factorization.

18031795731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111107 (or 111104 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 45.

The spelling of 18031795731 in words is "eighteen billion, thirty-one million, seven hundred ninety-five thousand, seven hundred thirty-one".