79107750121 has 9 divisors (see below), whose sum is σ = 79728228741. Its totient is φ = 78492069792.

The previous prime is 79107750119. The next prime is 79107750193. The reversal of 79107750121 is 12105770197.

The square root of 79107750121 is 281261.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 853282521 + 78254467600 = 29211^2 + 279740^2 .

It is not a de Polignac number, because 79107750121 - 2¹ = 79107750119 is a prime.

It is a super-2 number, since 2×79107750121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79107750721) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 38531731 + ... + 38533783.

Almost surely, 2^79107750121 is an apocalyptic number.

79107750121 is the 281261-st square number.

79107750121 is the 140631-st centered octagonal number.

It is an amenable number.

79107750121 is a deficient number, since it is larger than the sum of its proper divisors (620478620).

79107750121 is an frugal number, since it uses more digits than its factorization.

79107750121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4380 (or 2190 counting only the distinct ones).

The product of its (nonzero) digits is 30870, while the sum is 40.

The spelling of 79107750121 in words is "seventy-nine billion, one hundred seven million, seven hundred fifty thousand, one hundred twenty-one".