79812155 has 4 divisors (see below), whose sum is σ = 95774592. Its totient is φ = 63849720.

The previous prime is 79812137. The next prime is 79812163. The reversal of 79812155 is 55121897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55121897 = 37 ⋅1489781.

It is not a de Polignac number, because 79812155 - 2¹² = 79808059 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7981211 + ... + 7981220.

It is an arithmetic number, because the mean of its divisors is an integer number (23943648).

Almost surely, 2^79812155 is an apocalyptic number.

79812155 is a deficient number, since it is larger than the sum of its proper divisors (15962437).

79812155 is a wasteful number, since it uses less digits than its factorization.

79812155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15962436.

The product of its digits is 25200, while the sum is 38.

The square root of 79812155 is about 8933.7648838550. The cubic root of 79812155 is about 430.5494238800.

The spelling of 79812155 in words is "seventy-nine million, eight hundred twelve thousand, one hundred fifty-five".