916979009 has 4 divisors (see below), whose sum is σ = 917816004. Its totient is φ = 916142016.

The previous prime is 916978961. The next prime is 916979033. The reversal of 916979009 is 900979619.

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

It can be written as a sum of positive squares in 2 ways, for example, as 410953984 + 506025025 = 20272^2 + 22495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-916979009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (916972009) 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, 416852 + ... + 419045.

It is an arithmetic number, because the mean of its divisors is an integer number (229454001).

Almost surely, 2^916979009 is an apocalyptic number.

It is an amenable number.

916979009 is a deficient number, since it is larger than the sum of its proper divisors (836995).

916979009 is a wasteful number, since it uses less digits than its factorization.

916979009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836994.

The product of its (nonzero) digits is 275562, while the sum is 50.

The square root of 916979009 is about 30281.6612655250. The cubic root of 916979009 is about 971.5231001345.

The spelling of 916979009 in words is "nine hundred sixteen million, nine hundred seventy-nine thousand, nine".