71856451 has 2 divisors, whose sum is σ = 71856452. Its totient is φ = 71856450.

The previous prime is 71856443. The next prime is 71856487. The reversal of 71856451 is 15465817.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71856451 - 2³ = 71856443 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71856451.

It is not a weakly prime, because it can be changed into another prime (71856401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35928225 + 35928226.

It is an arithmetic number, because the mean of its divisors is an integer number (35928226).

Almost surely, 2^71856451 is an apocalyptic number.

71856451 is a deficient number, since it is larger than the sum of its proper divisors (1).

71856451 is an equidigital number, since it uses as much as digits as its factorization.

71856451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33600, while the sum is 37.

The square root of 71856451 is about 8476.8184479792. The cubic root of 71856451 is about 415.7401047845.

The spelling of 71856451 in words is "seventy-one million, eight hundred fifty-six thousand, four hundred fifty-one".