78915313 has 2 divisors, whose sum is σ = 78915314. Its totient is φ = 78915312.

The previous prime is 78915301. The next prime is 78915329. The reversal of 78915313 is 31351987.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77141089 + 1774224 = 8783^2 + 1332^2 .

It is a cyclic number.

It is not a de Polignac number, because 78915313 - 2⁵ = 78915281 is a prime.

It is not a weakly prime, because it can be changed into another prime (78915373) 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, 39457656 + 39457657.

It is an arithmetic number, because the mean of its divisors is an integer number (39457657).

Almost surely, 2^78915313 is an apocalyptic number.

It is an amenable number.

78915313 is a deficient number, since it is larger than the sum of its proper divisors (1).

78915313 is an equidigital number, since it uses as much as digits as its factorization.

78915313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 37.

The square root of 78915313 is about 8883.4291239363. The cubic root of 78915313 is about 428.9306636620.

The spelling of 78915313 in words is "seventy-eight million, nine hundred fifteen thousand, three hundred thirteen".