79581157 has 4 divisors (see below), whose sum is σ = 79745056. Its totient is φ = 79417260.

The previous prime is 79581137. The next prime is 79581163. The reversal of 79581157 is 75118597.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75118597 = 17 ⋅4418741.

It is a cyclic number.

It is not a de Polignac number, because 79581157 - 2¹¹ = 79579109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79581107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81219 + ... + 82192.

It is an arithmetic number, because the mean of its divisors is an integer number (19936264).

Almost surely, 2^79581157 is an apocalyptic number.

It is an amenable number.

79581157 is a deficient number, since it is larger than the sum of its proper divisors (163899).

79581157 is a wasteful number, since it uses less digits than its factorization.

79581157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163898.

The product of its digits is 88200, while the sum is 43.

The square root of 79581157 is about 8920.8271477481. The cubic root of 79581157 is about 430.1336469376.

The spelling of 79581157 in words is "seventy-nine million, five hundred eighty-one thousand, one hundred fifty-seven".