971899731 has 12 divisors (see below), whose sum is σ = 1531478520. Its totient is φ = 589030080.

The previous prime is 971899729. The next prime is 971899751. The reversal of 971899731 is 137998179.

It is not a de Polignac number, because 971899731 - 2¹ = 971899729 is a prime.

It is a super-2 number, since 2×971899731² = 1889178174235744722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (971899751) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4908486 + ... + 4908683.

It is an arithmetic number, because the mean of its divisors is an integer number (127623210).

Almost surely, 2^971899731 is an apocalyptic number.

971899731 is a deficient number, since it is larger than the sum of its proper divisors (559578789).

971899731 is a wasteful number, since it uses less digits than its factorization.

971899731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9817186 (or 9817183 counting only the distinct ones).

The product of its digits is 857304, while the sum is 54.

The square root of 971899731 is about 31175.3064299294. The cubic root of 971899731 is about 990.5441116716.

The spelling of 971899731 in words is "nine hundred seventy-one million, eight hundred ninety-nine thousand, seven hundred thirty-one".