79143391 has 4 divisors (see below), whose sum is σ = 82584432. Its totient is φ = 75702352.

The previous prime is 79143377. The next prime is 79143397. The reversal of 79143391 is 19334197.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 79143391 - 2¹⁷ = 79012319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79143391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79143397) 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, 1720486 + ... + 1720531.

It is an arithmetic number, because the mean of its divisors is an integer number (20646108).

Almost surely, 2^79143391 is an apocalyptic number.

79143391 is a deficient number, since it is larger than the sum of its proper divisors (3441041).

79143391 is a wasteful number, since it uses less digits than its factorization.

79143391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3441040.

The product of its digits is 20412, while the sum is 37.

The square root of 79143391 is about 8896.2571343234. The cubic root of 79143391 is about 429.3434925009.

The spelling of 79143391 in words is "seventy-nine million, one hundred forty-three thousand, three hundred ninety-one".