71131525 has 12 divisors (see below), whose sum is σ = 92038752. Its totient is φ = 54430640.

The previous prime is 71131523. The next prime is 71131531. The reversal of 71131525 is 52513117.

It is not a de Polignac number, because 71131525 - 2¹ = 71131523 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71131525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71131523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61279 + ... + 62428.

It is an arithmetic number, because the mean of its divisors is an integer number (7669896).

Almost surely, 2^71131525 is an apocalyptic number.

It is an amenable number.

71131525 is a deficient number, since it is larger than the sum of its proper divisors (20907227).

71131525 is a wasteful number, since it uses less digits than its factorization.

71131525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123740 (or 123735 counting only the distinct ones).

The product of its digits is 1050, while the sum is 25.

The square root of 71131525 is about 8433.9507349759. The cubic root of 71131525 is about 414.3373078545.

The spelling of 71131525 in words is "seventy-one million, one hundred thirty-one thousand, five hundred twenty-five".