71597131 has 4 divisors (see below), whose sum is σ = 71734552. Its totient is φ = 71459712.

The previous prime is 71597083. The next prime is 71597167. The reversal of 71597131 is 13179517.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71597131 is a prime.

It is a super-2 number, since 2×71597131² = 10252298334862322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71597191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67926 + ... + 68971.

It is an arithmetic number, because the mean of its divisors is an integer number (17933638).

Almost surely, 2^71597131 is an apocalyptic number.

71597131 is a deficient number, since it is larger than the sum of its proper divisors (137421).

71597131 is a wasteful number, since it uses less digits than its factorization.

71597131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137420.

The product of its digits is 6615, while the sum is 34.

The square root of 71597131 is about 8461.5087898081. The cubic root of 71597131 is about 415.2393857664.

The spelling of 71597131 in words is "seventy-one million, five hundred ninety-seven thousand, one hundred thirty-one".