981151731 has 16 divisors (see below), whose sum is σ = 1661209600. Its totient is φ = 560658024.

The previous prime is 981151711. The next prime is 981151763. The reversal of 981151731 is 137151189.

It is not a de Polignac number, because 981151731 - 2⁷ = 981151603 is a prime.

It is a super-2 number, since 2×981151731² = 1925317438488592722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981151711) 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, 2595451 + ... + 2595828.

It is an arithmetic number, because the mean of its divisors is an integer number (103825600).

Almost surely, 2^981151731 is an apocalyptic number.

981151731 is a deficient number, since it is larger than the sum of its proper divisors (680057869).

981151731 is a wasteful number, since it uses less digits than its factorization.

981151731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5191295 (or 5191289 counting only the distinct ones).

The product of its digits is 7560, while the sum is 36.

The square root of 981151731 is about 31323.3416320801. The cubic root of 981151731 is about 993.6773520406.

The spelling of 981151731 in words is "nine hundred eighty-one million, one hundred fifty-one thousand, seven hundred thirty-one".