9971731 has 24 divisors (see below), whose sum is σ = 12797792. Its totient is φ = 7603200.

The previous prime is 9971729. The next prime is 9971749. The reversal of 9971731 is 1371799.

It is not a de Polignac number, because 9971731 - 2¹ = 9971729 is a prime.

It is a super-2 number, since 2×9971731² = 198870838272722, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (9971711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51571 + ... + 51763.

Almost surely, 2^9971731 is an apocalyptic number.

9971731 is a deficient number, since it is larger than the sum of its proper divisors (2826061).

9971731 is a wasteful number, since it uses less digits than its factorization.

9971731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283 (or 272 counting only the distinct ones).

The product of its digits is 11907, while the sum is 37.

The square root of 9971731 is about 3157.8047754730. The cubic root of 9971731 is about 215.2402650228.

The spelling of 9971731 in words is "nine million, nine hundred seventy-one thousand, seven hundred thirty-one".