84618631 has 2 divisors, whose sum is σ = 84618632. Its totient is φ = 84618630.

The previous prime is 84618617. The next prime is 84618637. The reversal of 84618631 is 13681648.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84618631 - 2¹¹ = 84616583 is a prime.

It is a super-2 number, since 2×84618631² = 14320625424628322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84618637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42309315 + 42309316.

It is an arithmetic number, because the mean of its divisors is an integer number (42309316).

Almost surely, 2^84618631 is an apocalyptic number.

84618631 is a deficient number, since it is larger than the sum of its proper divisors (1).

84618631 is an equidigital number, since it uses as much as digits as its factorization.

84618631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 37.

The square root of 84618631 is about 9198.8385679932. The cubic root of 84618631 is about 439.0244069846.

The spelling of 84618631 in words is "eighty-four million, six hundred eighteen thousand, six hundred thirty-one".