71997513 has 24 divisors (see below), whose sum is σ = 111989952. Its totient is φ = 41023584.

The previous prime is 71997503. The next prime is 71997553. The reversal of 71997513 is 31579917.

It is not a de Polignac number, because 71997513 - 2⁵ = 71997481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71997503) 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, 94731 + ... + 95487.

It is an arithmetic number, because the mean of its divisors is an integer number (4666248).

Almost surely, 2^71997513 is an apocalyptic number.

It is an amenable number.

71997513 is a deficient number, since it is larger than the sum of its proper divisors (39992439).

71997513 is a wasteful number, since it uses less digits than its factorization.

71997513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1421 (or 1414 counting only the distinct ones).

The product of its digits is 59535, while the sum is 42.

The square root of 71997513 is about 8485.1348250926. The cubic root of 71997513 is about 416.0119745844.

The spelling of 71997513 in words is "seventy-one million, nine hundred ninety-seven thousand, five hundred thirteen".