9971681574 has 32 divisors (see below), whose sum is σ = 21228912000. Its totient is φ = 3113567424.

The previous prime is 9971681567. The next prime is 9971681597. The reversal of 9971681574 is 4751861799.

It is a super-2 number, since 2×9971681574² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 481264 + ... + 501555.

It is an arithmetic number, because the mean of its divisors is an integer number (663403500).

Almost surely, 2^9971681574 is an apocalyptic number.

9971681574 is an abundant number, since it is smaller than the sum of its proper divisors (11257230426).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9971681574 is a wasteful number, since it uses less digits than its factorization.

9971681574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982932.

The product of its digits is 3810240, while the sum is 57.

The square root of 9971681574 is about 99858.3074861576. The cubic root of 9971681574 is about 2152.3990940138.

The spelling of 9971681574 in words is "nine billion, nine hundred seventy-one million, six hundred eighty-one thousand, five hundred seventy-four".