79507381 has 4 divisors (see below), whose sum is σ = 83692000. Its totient is φ = 75322764.

The previous prime is 79507369. The next prime is 79507403. The reversal of 79507381 is 18370597.

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: 18370597 = 7 ⋅2624371.

It is a de Polignac number, because none of the positive numbers 2^k-79507381 is a prime.

It is a super-2 number, since 2×79507381² = 12642847266958322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79507361) 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, 2092281 + ... + 2092318.

It is an arithmetic number, because the mean of its divisors is an integer number (20923000).

Almost surely, 2^79507381 is an apocalyptic number.

It is an amenable number.

79507381 is a deficient number, since it is larger than the sum of its proper divisors (4184619).

79507381 is a wasteful number, since it uses less digits than its factorization.

79507381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4184618.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 79507381 is about 8916.6911463838. The cubic root of 79507381 is about 430.0006868567. Note that the first 3 decimals are identical.

The spelling of 79507381 in words is "seventy-nine million, five hundred seven thousand, three hundred eighty-one".