78995121 has 4 divisors (see below), whose sum is σ = 105326832. Its totient is φ = 52663412.

The previous prime is 78995089. The next prime is 78995131. The reversal of 78995121 is 12159987.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78995121 - 2⁵ = 78995089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78995131) 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, 13165851 + ... + 13165856.

It is an arithmetic number, because the mean of its divisors is an integer number (26331708).

Almost surely, 2^78995121 is an apocalyptic number.

It is an amenable number.

78995121 is a deficient number, since it is larger than the sum of its proper divisors (26331711).

78995121 is a wasteful number, since it uses less digits than its factorization.

78995121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26331710.

The product of its digits is 45360, while the sum is 42.

The square root of 78995121 is about 8887.9199478843. The cubic root of 78995121 is about 429.0752091830.

The spelling of 78995121 in words is "seventy-eight million, nine hundred ninety-five thousand, one hundred twenty-one".