5131981731 has 16 divisors (see below), whose sum is σ = 6906643200. Its totient is φ = 3389464608.

The previous prime is 5131981727. The next prime is 5131981783. The reversal of 5131981731 is 1371891315.

It is not a de Polignac number, because 5131981731 - 2² = 5131981727 is a prime.

It is a super-2 number, since 2×5131981731² = 52674472974635512722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 5131981731.

It is not an unprimeable number, because it can be changed into a prime (5131981721) 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, 126690 + ... + 162216.

It is an arithmetic number, because the mean of its divisors is an integer number (431665200).

Almost surely, 2^5131981731 is an apocalyptic number.

5131981731 is a deficient number, since it is larger than the sum of its proper divisors (1774661469).

5131981731 is a wasteful number, since it uses less digits than its factorization.

5131981731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35978.

The product of its digits is 22680, while the sum is 39.

The square root of 5131981731 is about 71637.8512449948. The cubic root of 5131981731 is about 1724.8911763317.

The spelling of 5131981731 in words is "five billion, one hundred thirty-one million, nine hundred eighty-one thousand, seven hundred thirty-one".