979531909 has 4 divisors (see below), whose sum is σ = 1031086240. Its totient is φ = 927977580.

The previous prime is 979531907. The next prime is 979531913. The reversal of 979531909 is 909135979.

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 979531909 - 2¹ = 979531907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (979531907) 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, 25777137 + ... + 25777174.

It is an arithmetic number, because the mean of its divisors is an integer number (257771560).

Almost surely, 2^979531909 is an apocalyptic number.

It is an amenable number.

979531909 is a deficient number, since it is larger than the sum of its proper divisors (51554331).

979531909 is a wasteful number, since it uses less digits than its factorization.

979531909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51554330.

The product of its (nonzero) digits is 688905, while the sum is 52.

The square root of 979531909 is about 31297.4744827758. The cubic root of 979531909 is about 993.1302171543.

The spelling of 979531909 in words is "nine hundred seventy-nine million, five hundred thirty-one thousand, nine hundred nine".