71390291 has 4 divisors (see below), whose sum is σ = 81588912. Its totient is φ = 61191672.

The previous prime is 71390273. The next prime is 71390299. The reversal of 71390291 is 19209317.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71390291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71390299) 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, 5099300 + ... + 5099313.

It is an arithmetic number, because the mean of its divisors is an integer number (20397228).

Almost surely, 2^71390291 is an apocalyptic number.

71390291 is a deficient number, since it is larger than the sum of its proper divisors (10198621).

71390291 is a wasteful number, since it uses less digits than its factorization.

71390291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10198620.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 71390291 is about 8449.2775430802. The cubic root of 71390291 is about 414.8391325023.

The spelling of 71390291 in words is "seventy-one million, three hundred ninety thousand, two hundred ninety-one".