71207391 has 16 divisors (see below), whose sum is σ = 96864768. Its totient is φ = 46519200.

The previous prime is 71207369. The next prime is 71207401. The reversal of 71207391 is 19370217.

It is not a de Polignac number, because 71207391 - 2⁷ = 71207263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71206391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37630 + ... + 39476.

It is an arithmetic number, because the mean of its divisors is an integer number (6054048).

Almost surely, 2^71207391 is an apocalyptic number.

71207391 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

71207391 is a deficient number, since it is larger than the sum of its proper divisors (25657377).

71207391 is a wasteful number, since it uses less digits than its factorization.

71207391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102.

The product of its (nonzero) digits is 2646, while the sum is 30.

The square root of 71207391 is about 8438.4471912787. The cubic root of 71207391 is about 414.4845606390.

The spelling of 71207391 in words is "seventy-one million, two hundred seven thousand, three hundred ninety-one".