79913819 has 2 divisors, whose sum is σ = 79913820. Its totient is φ = 79913818.

The previous prime is 79913783. The next prime is 79913833. The reversal of 79913819 is 91831997.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79913819 - 2²⁰ = 78865243 is a prime.

It is a super-2 number, since 2×79913819² = 12772436934329522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79913839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39956909 + 39956910.

It is an arithmetic number, because the mean of its divisors is an integer number (39956910).

Almost surely, 2^79913819 is an apocalyptic number.

79913819 is a deficient number, since it is larger than the sum of its proper divisors (1).

79913819 is an equidigital number, since it uses as much as digits as its factorization.

79913819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 47.

The square root of 79913819 is about 8939.4529474683. The cubic root of 79913819 is about 430.7321562995.

The spelling of 79913819 in words is "seventy-nine million, nine hundred thirteen thousand, eight hundred nineteen".