79161919 has 2 divisors, whose sum is σ = 79161920. Its totient is φ = 79161918.

The previous prime is 79161899. The next prime is 79161931. The reversal of 79161919 is 91916197.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (91916197) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79161919 - 2¹⁵ = 79129151 is a prime.

It is a super-2 number, since 2×79161919² = 12533218839525122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79161949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39580959 + 39580960.

It is an arithmetic number, because the mean of its divisors is an integer number (39580960).

Almost surely, 2^79161919 is an apocalyptic number.

79161919 is a deficient number, since it is larger than the sum of its proper divisors (1).

79161919 is an equidigital number, since it uses as much as digits as its factorization.

79161919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30618, while the sum is 43.

The square root of 79161919 is about 8897.2984101917. The cubic root of 79161919 is about 429.3769939529.

The spelling of 79161919 in words is "seventy-nine million, one hundred sixty-one thousand, nine hundred nineteen".