84219631 has 2 divisors, whose sum is σ = 84219632. Its totient is φ = 84219630.

The previous prime is 84219623. The next prime is 84219637. The reversal of 84219631 is 13691248.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84219631 - 2³ = 84219623 is a prime.

It is a super-2 number, since 2×84219631² = 14185892491552322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84219637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42109815 + 42109816.

It is an arithmetic number, because the mean of its divisors is an integer number (42109816).

Almost surely, 2^84219631 is an apocalyptic number.

84219631 is a deficient number, since it is larger than the sum of its proper divisors (1).

84219631 is an equidigital number, since it uses as much as digits as its factorization.

84219631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 34.

The square root of 84219631 is about 9177.1254213942. The cubic root of 84219631 is about 438.3332794878. Note that the first 3 decimals are identical.

The spelling of 84219631 in words is "eighty-four million, two hundred nineteen thousand, six hundred thirty-one".