84531631 has 2 divisors, whose sum is σ = 84531632. Its totient is φ = 84531630.

The previous prime is 84531553. The next prime is 84531673. The reversal of 84531631 is 13613548.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84531631 is a prime.

It is a super-2 number, since 2×84531631² = 14291193279040322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 84531593 and 84531602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84531731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42265815 + 42265816.

It is an arithmetic number, because the mean of its divisors is an integer number (42265816).

Almost surely, 2^84531631 is an apocalyptic number.

84531631 is a deficient number, since it is larger than the sum of its proper divisors (1).

84531631 is an equidigital number, since it uses as much as digits as its factorization.

84531631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 84531631 is about 9194.1084940303. The cubic root of 84531631 is about 438.8738955254.

The spelling of 84531631 in words is "eighty-four million, five hundred thirty-one thousand, six hundred thirty-one".