79087993 has 2 divisors, whose sum is σ = 79087994. Its totient is φ = 79087992.

The previous prime is 79087919. The next prime is 79087997. The reversal of 79087993 is 39978097.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62220544 + 16867449 = 7888^2 + 4107^2 .

It is an emirp because it is prime and its reverse (39978097) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79087993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79087993.

It is not a weakly prime, because it can be changed into another prime (79087997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39543996 + 39543997.

It is an arithmetic number, because the mean of its divisors is an integer number (39543997).

Almost surely, 2^79087993 is an apocalyptic number.

It is an amenable number.

79087993 is a deficient number, since it is larger than the sum of its proper divisors (1).

79087993 is an equidigital number, since it uses as much as digits as its factorization.

79087993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 857304, while the sum is 52.

The square root of 79087993 is about 8893.1430326966. The cubic root of 79087993 is about 429.2432932625.

The spelling of 79087993 in words is "seventy-nine million, eighty-seven thousand, nine hundred ninety-three".