79542091 has 8 divisors (see below), whose sum is σ = 81900000. Its totient is φ = 77204160.

The previous prime is 79542077. The next prime is 79542101. The reversal of 79542091 is 19024597.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79542091 - 2¹⁹ = 79017803 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 79542091.

It is not an unprimeable number, because it can be changed into a prime (79542061) 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 7 ways as a sum of consecutive naturals, for example, 3285 + ... + 13033.

It is an arithmetic number, because the mean of its divisors is an integer number (10237500).

Almost surely, 2^79542091 is an apocalyptic number.

79542091 is a deficient number, since it is larger than the sum of its proper divisors (2357909).

79542091 is a wasteful number, since it uses less digits than its factorization.

79542091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9989.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 79542091 is about 8918.6372838007. The cubic root of 79542091 is about 430.0632519176.

The spelling of 79542091 in words is "seventy-nine million, five hundred forty-two thousand, ninety-one".