84407681 has 2 divisors, whose sum is σ = 84407682. Its totient is φ = 84407680.

The previous prime is 84407663. The next prime is 84407707. The reversal of 84407681 is 18670448.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75968656 + 8439025 = 8716^2 + 2905^2 .

It is a cyclic number.

It is not a de Polignac number, because 84407681 - 2²² = 80213377 is a prime.

It is a super-2 number, since 2×84407681² = 14249313223595522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84407621) 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, 42203840 + 42203841.

It is an arithmetic number, because the mean of its divisors is an integer number (42203841).

Almost surely, 2^84407681 is an apocalyptic number.

It is an amenable number.

84407681 is a deficient number, since it is larger than the sum of its proper divisors (1).

84407681 is an equidigital number, since it uses as much as digits as its factorization.

84407681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 84407681 is about 9187.3652915294. The cubic root of 84407681 is about 438.6592814659.

The spelling of 84407681 in words is "eighty-four million, four hundred seven thousand, six hundred eighty-one".