79121755 has 4 divisors (see below), whose sum is σ = 94946112. Its totient is φ = 63297400.

The previous prime is 79121753. The next prime is 79121767. The reversal of 79121755 is 55712197.

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

It is not a de Polignac number, because 79121755 - 2¹ = 79121753 is a prime.

It is a super-2 number, since 2×79121755² = 12520504228560050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79121753) 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, 7912171 + ... + 7912180.

It is an arithmetic number, because the mean of its divisors is an integer number (23736528).

Almost surely, 2^79121755 is an apocalyptic number.

79121755 is a deficient number, since it is larger than the sum of its proper divisors (15824357).

79121755 is a wasteful number, since it uses less digits than its factorization.

79121755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15824356.

The product of its digits is 22050, while the sum is 37.

The square root of 79121755 is about 8895.0410341943. The cubic root of 79121755 is about 429.3043646921.

The spelling of 79121755 in words is "seventy-nine million, one hundred twenty-one thousand, seven hundred fifty-five".