84459439531 has 2 divisors, whose sum is σ = 84459439532. Its totient is φ = 84459439530.

The previous prime is 84459439507. The next prime is 84459439553. The reversal of 84459439531 is 13593495448.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84459439531 - 2¹⁹ = 84458915243 is a prime.

It is a super-2 number, since 2×84459439531² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (84459436531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42229719765 + 42229719766.

It is an arithmetic number, because the mean of its divisors is an integer number (42229719766).

Almost surely, 2^84459439531 is an apocalyptic number.

84459439531 is a deficient number, since it is larger than the sum of its proper divisors (1).

84459439531 is an equidigital number, since it uses as much as digits as its factorization.

84459439531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9331200, while the sum is 55.

The spelling of 84459439531 in words is "eighty-four billion, four hundred fifty-nine million, four hundred thirty-nine thousand, five hundred thirty-one".