31493793131 has 4 divisors (see below), whose sum is σ = 31675838352. Its totient is φ = 31311747912.

The previous prime is 31493793109. The next prime is 31493793137. The reversal of 31493793131 is 13139739413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13139739413 = 23473 ⋅559781.

It is a cyclic number.

It is not a de Polignac number, because 31493793131 - 2¹⁴ = 31493776747 is a prime.

It is a super-2 number, since 2×31493793131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31493793137) 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 3 ways as a sum of consecutive naturals, for example, 91022351 + ... + 91022696.

It is an arithmetic number, because the mean of its divisors is an integer number (7918959588).

Almost surely, 2^31493793131 is an apocalyptic number.

31493793131 is a deficient number, since it is larger than the sum of its proper divisors (182045221).

31493793131 is a wasteful number, since it uses less digits than its factorization.

31493793131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182045220.

The product of its digits is 183708, while the sum is 44.

The spelling of 31493793131 in words is "thirty-one billion, four hundred ninety-three million, seven hundred ninety-three thousand, one hundred thirty-one".