79503121 has 4 divisors (see below), whose sum is σ = 81651892. Its totient is φ = 77354352.

The previous prime is 79503091. The next prime is 79503131. The reversal of 79503121 is 12130597.

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

It can be written as a sum of positive squares in 2 ways, for example, as 43033600 + 36469521 = 6560^2 + 6039^2 .

It is a cyclic number.

It is not a de Polignac number, because 79503121 - 2⁵ = 79503089 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 79503121.

It is not an unprimeable number, because it can be changed into a prime (79503131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1074330 + ... + 1074403.

It is an arithmetic number, because the mean of its divisors is an integer number (20412973).

Almost surely, 2^79503121 is an apocalyptic number.

It is an amenable number.

79503121 is a deficient number, since it is larger than the sum of its proper divisors (2148771).

79503121 is a wasteful number, since it uses less digits than its factorization.

79503121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148770.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 79503121 is about 8916.4522653351. The cubic root of 79503121 is about 429.9930069171.

The spelling of 79503121 in words is "seventy-nine million, five hundred three thousand, one hundred twenty-one".