31519431131 has 4 divisors (see below), whose sum is σ = 31522344600. Its totient is φ = 31516517664.

The previous prime is 31519431107. The next prime is 31519431149. The reversal of 31519431131 is 13113491513.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31519431131 - 2¹⁴ = 31519414747 is a prime.

It is a super-2 number, since 2×31519431131² (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 (31519431191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1440446 + ... + 1462163.

It is an arithmetic number, because the mean of its divisors is an integer number (7880586150).

Almost surely, 2^31519431131 is an apocalyptic number.

31519431131 is a deficient number, since it is larger than the sum of its proper divisors (2913469).

31519431131 is a wasteful number, since it uses less digits than its factorization.

31519431131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2913468.

The product of its digits is 4860, while the sum is 32.

The spelling of 31519431131 in words is "thirty-one billion, five hundred nineteen million, four hundred thirty-one thousand, one hundred thirty-one".