978120051 has 4 divisors (see below), whose sum is σ = 1304160072. Its totient is φ = 652080032.

The previous prime is 978120047. The next prime is 978120053. The reversal of 978120051 is 150021879.

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

It is a cyclic number.

It is not a de Polignac number, because 978120051 - 2² = 978120047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 978119994 and 978120021.

It is not an unprimeable number, because it can be changed into a prime (978120053) 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, 163020006 + ... + 163020011.

It is an arithmetic number, because the mean of its divisors is an integer number (326040018).

Almost surely, 2^978120051 is an apocalyptic number.

978120051 is a deficient number, since it is larger than the sum of its proper divisors (326040021).

978120051 is a wasteful number, since it uses less digits than its factorization.

978120051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326040020.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 978120051 is about 31274.9108871632. The cubic root of 978120051 is about 992.6528350357.

The spelling of 978120051 in words is "nine hundred seventy-eight million, one hundred twenty thousand, fifty-one".