84679901 has 2 divisors, whose sum is σ = 84679902. Its totient is φ = 84679900.

The previous prime is 84679891. The next prime is 84679909. The reversal of 84679901 is 10997648.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74407876 + 10272025 = 8626^2 + 3205^2 .

It is a cyclic number.

It is not a de Polignac number, because 84679901 - 2²² = 80485597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84679909) 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, 42339950 + 42339951.

It is an arithmetic number, because the mean of its divisors is an integer number (42339951).

Almost surely, 2^84679901 is an apocalyptic number.

It is an amenable number.

84679901 is a deficient number, since it is larger than the sum of its proper divisors (1).

84679901 is an equidigital number, since it uses as much as digits as its factorization.

84679901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 84679901 is about 9202.1682770964. The cubic root of 84679901 is about 439.1303432126.

The spelling of 84679901 in words is "eighty-four million, six hundred seventy-nine thousand, nine hundred one".