71392231 has 4 divisors (see below), whose sum is σ = 75591792. Its totient is φ = 67192672.

The previous prime is 71392187. The next prime is 71392241. The reversal of 71392231 is 13229317.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13229317 = 461 ⋅28697.

It is a cyclic number.

It is not a de Polignac number, because 71392231 - 2²⁵ = 37837799 is a prime.

It is a super-2 number, since 2×71392231² = 10193701294314722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71392231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71392241) 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, 2099755 + ... + 2099788.

It is an arithmetic number, because the mean of its divisors is an integer number (18897948).

Almost surely, 2^71392231 is an apocalyptic number.

71392231 is a deficient number, since it is larger than the sum of its proper divisors (4199561).

71392231 is a wasteful number, since it uses less digits than its factorization.

71392231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4199560.

The product of its digits is 2268, while the sum is 28.

The square root of 71392231 is about 8449.3923450151. The cubic root of 71392231 is about 414.8428901590.

The spelling of 71392231 in words is "seventy-one million, three hundred ninety-two thousand, two hundred thirty-one".