71612813 has 2 divisors, whose sum is σ = 71612814. Its totient is φ = 71612812.

The previous prime is 71612809. The next prime is 71612833. The reversal of 71612813 is 31821617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39100009 + 32512804 = 6253^2 + 5702^2 .

It is a cyclic number.

It is not a de Polignac number, because 71612813 - 2² = 71612809 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71612833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35806406 + 35806407.

It is an arithmetic number, because the mean of its divisors is an integer number (35806407).

Almost surely, 2^71612813 is an apocalyptic number.

It is an amenable number.

71612813 is a deficient number, since it is larger than the sum of its proper divisors (1).

71612813 is an equidigital number, since it uses as much as digits as its factorization.

71612813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 29.

The square root of 71612813 is about 8462.4354059573. The cubic root of 71612813 is about 415.2697003363.

The spelling of 71612813 in words is "seventy-one million, six hundred twelve thousand, eight hundred thirteen".