791979989 has 2 divisors, whose sum is σ = 791979990. Its totient is φ = 791979988.

The previous prime is 791979959. The next prime is 791980061. The reversal of 791979989 is 989979197.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 720492964 + 71487025 = 26842^2 + 8455^2 .

It is a cyclic number.

It is not a de Polignac number, because 791979989 - 2¹² = 791975893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (791979959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 395989994 + 395989995.

It is an arithmetic number, because the mean of its divisors is an integer number (395989995).

Almost surely, 2^791979989 is an apocalyptic number.

It is an amenable number.

791979989 is a deficient number, since it is larger than the sum of its proper divisors (1).

791979989 is an equidigital number, since it uses as much as digits as its factorization.

791979989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23147208, while the sum is 68.

The square root of 791979989 is about 28142.1390267336. The cubic root of 791979989 is about 925.2052094993.

The spelling of 791979989 in words is "seven hundred ninety-one million, nine hundred seventy-nine thousand, nine hundred eighty-nine".