84631712251 has 2 divisors, whose sum is σ = 84631712252. Its totient is φ = 84631712250.

The previous prime is 84631712173. The next prime is 84631712261. The reversal of 84631712251 is 15221713648.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84631712251 is a prime.

It is not a weakly prime, because it can be changed into another prime (84631712261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42315856125 + 42315856126.

It is an arithmetic number, because the mean of its divisors is an integer number (42315856126).

Almost surely, 2^84631712251 is an apocalyptic number.

84631712251 is a deficient number, since it is larger than the sum of its proper divisors (1).

84631712251 is an equidigital number, since it uses as much as digits as its factorization.

84631712251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 40.

The spelling of 84631712251 in words is "eighty-four billion, six hundred thirty-one million, seven hundred twelve thousand, two hundred fifty-one".