71315291 has 2 divisors, whose sum is σ = 71315292. Its totient is φ = 71315290.

The previous prime is 71315287. The next prime is 71315297. The reversal of 71315291 is 19251317.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71315291 - 2² = 71315287 is a prime.

It is not a weakly prime, because it can be changed into another prime (71315297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35657645 + 35657646.

It is an arithmetic number, because the mean of its divisors is an integer number (35657646).

Almost surely, 2^71315291 is an apocalyptic number.

71315291 is a deficient number, since it is larger than the sum of its proper divisors (1).

71315291 is an equidigital number, since it uses as much as digits as its factorization.

71315291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1890, while the sum is 29.

The square root of 71315291 is about 8444.8381275191. The cubic root of 71315291 is about 414.6938100491.

The spelling of 71315291 in words is "seventy-one million, three hundred fifteen thousand, two hundred ninety-one".