9971991141 has 32 divisors (see below), whose sum is σ = 16266316800. Its totient is φ = 5306860800.

The previous prime is 9971991137. The next prime is 9971991143. The reversal of 9971991141 is 1411991799.

It is not a de Polignac number, because 9971991141 - 2² = 9971991137 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9971991143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 188260 + ... + 235341.

It is an arithmetic number, because the mean of its divisors is an integer number (508322400).

Almost surely, 2^9971991141 is an apocalyptic number.

It is an amenable number.

9971991141 is a deficient number, since it is larger than the sum of its proper divisors (6294325659).

9971991141 is a wasteful number, since it uses less digits than its factorization.

9971991141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423689.

The product of its digits is 183708, while the sum is 51.

The square root of 9971991141 is about 99859.8575054060. The cubic root of 9971991141 is about 2152.4213672492.

The spelling of 9971991141 in words is "nine billion, nine hundred seventy-one million, nine hundred ninety-one thousand, one hundred forty-one".