78597913 has 2 divisors, whose sum is σ = 78597914. Its totient is φ = 78597912.

The previous prime is 78597907. The next prime is 78597997. The reversal of 78597913 is 31979587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76247824 + 2350089 = 8732^2 + 1533^2 .

It is an emirp because it is prime and its reverse (31979587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78597913 - 2⁵ = 78597881 is a prime.

It is not a weakly prime, because it can be changed into another prime (78594913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39298956 + 39298957.

It is an arithmetic number, because the mean of its divisors is an integer number (39298957).

Almost surely, 2^78597913 is an apocalyptic number.

It is an amenable number.

78597913 is a deficient number, since it is larger than the sum of its proper divisors (1).

78597913 is an equidigital number, since it uses as much as digits as its factorization.

78597913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 476280, while the sum is 49.

The square root of 78597913 is about 8865.5464016608. The cubic root of 78597913 is about 428.3548331937.

The spelling of 78597913 in words is "seventy-eight million, five hundred ninety-seven thousand, nine hundred thirteen".