79291139 has 4 divisors (see below), whose sum is σ = 79391424. Its totient is φ = 79190856.

The previous prime is 79291129. The next prime is 79291193. The reversal of 79291139 is 93119297.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93119297 = 139 ⋅669923.

It is a cyclic number.

It is not a de Polignac number, because 79291139 - 2¹⁶ = 79225603 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79291096 and 79291105.

It is not an unprimeable number, because it can be changed into a prime (79291129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48947 + ... + 50540.

It is an arithmetic number, because the mean of its divisors is an integer number (19847856).

Almost surely, 2^79291139 is an apocalyptic number.

79291139 is a deficient number, since it is larger than the sum of its proper divisors (100285).

79291139 is an equidigital number, since it uses as much as digits as its factorization.

79291139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100284.

The product of its digits is 30618, while the sum is 41.

The square root of 79291139 is about 8904.5572040388. The cubic root of 79291139 is about 429.6104981991.

The spelling of 79291139 in words is "seventy-nine million, two hundred ninety-one thousand, one hundred thirty-nine".