71131597 has 4 divisors (see below), whose sum is σ = 72866556. Its totient is φ = 69396640.

The previous prime is 71131591. The next prime is 71131603. The reversal of 71131597 is 79513117.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79513117 = 1627 ⋅48871.

It is an interprime number because it is at equal distance from previous prime (71131591) and next prime (71131603).

It can be written as a sum of positive squares in 2 ways, for example, as 16208676 + 54922921 = 4026^2 + 7411^2 .

It is a cyclic number.

It is not a de Polignac number, because 71131597 - 2⁷ = 71131469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71131591) 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, 867418 + ... + 867499.

It is an arithmetic number, because the mean of its divisors is an integer number (18216639).

Almost surely, 2^71131597 is an apocalyptic number.

It is an amenable number.

71131597 is a deficient number, since it is larger than the sum of its proper divisors (1734959).

71131597 is a wasteful number, since it uses less digits than its factorization.

71131597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1734958.

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

The square root of 71131597 is about 8433.9550034370. The cubic root of 71131597 is about 414.3374476532.

The spelling of 71131597 in words is "seventy-one million, one hundred thirty-one thousand, five hundred ninety-seven".