979121777 has 4 divisors (see below), whose sum is σ = 979399536. Its totient is φ = 978844020.

The previous prime is 979121761. The next prime is 979121827. The reversal of 979121777 is 777121979.

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 979121777 - 2⁴ = 979121761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (979121747) 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, 133523 + ... + 140664.

It is an arithmetic number, because the mean of its divisors is an integer number (244849884).

Almost surely, 2^979121777 is an apocalyptic number.

It is an amenable number.

979121777 is a deficient number, since it is larger than the sum of its proper divisors (277759).

979121777 is a wasteful number, since it uses less digits than its factorization.

979121777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277758.

The product of its digits is 388962, while the sum is 50.

The square root of 979121777 is about 31290.9216387118. The cubic root of 979121777 is about 992.9915892582.

The spelling of 979121777 in words is "nine hundred seventy-nine million, one hundred twenty-one thousand, seven hundred seventy-seven".