71391915 has 64 divisors (see below), whose sum is σ = 149790720. Its totient is φ = 31570560.

The previous prime is 71391893. The next prime is 71391923. The reversal of 71391915 is 51919317.

It is not a de Polignac number, because 71391915 - 2⁷ = 71391787 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 71391915.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 28077 + ... + 30513.

It is an arithmetic number, because the mean of its divisors is an integer number (2340480).

Almost surely, 2^71391915 is an apocalyptic number.

71391915 is an abundant number, since it is smaller than the sum of its proper divisors (78398805).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71391915 is a wasteful number, since it uses less digits than its factorization.

71391915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2489 (or 2483 counting only the distinct ones).

The product of its digits is 8505, while the sum is 36.

The square root of 71391915 is about 8449.3736454248. The cubic root of 71391915 is about 414.8422780917.

The spelling of 71391915 in words is "seventy-one million, three hundred ninety-one thousand, nine hundred fifteen".