79138019 has 2 divisors, whose sum is σ = 79138020. Its totient is φ = 79138018.

The previous prime is 79138001. The next prime is 79138027. The reversal of 79138019 is 91083197.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79138019 - 2⁸ = 79137763 is a prime.

It is a super-2 number, since 2×79138019² = 12525652102488722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79138039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39569009 + 39569010.

It is an arithmetic number, because the mean of its divisors is an integer number (39569010).

Almost surely, 2^79138019 is an apocalyptic number.

79138019 is a deficient number, since it is larger than the sum of its proper divisors (1).

79138019 is an equidigital number, since it uses as much as digits as its factorization.

79138019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 79138019 is about 8895.9552044735. The cubic root of 79138019 is about 429.3337781272. Note that the first 3 decimals are identical.

The spelling of 79138019 in words is "seventy-nine million, one hundred thirty-eight thousand, nineteen".