979509889 has 4 divisors (see below), whose sum is σ = 980121024. Its totient is φ = 978898756.

The previous prime is 979509871. The next prime is 979509919. The reversal of 979509889 is 988905979.

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, and also an emirpimes, since its reverse is a distinct semiprime: 988905979 = 97 ⋅10194907.

It is a cyclic number.

It is not a de Polignac number, because 979509889 - 2⁷ = 979509761 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 979509889.

It is not an unprimeable number, because it can be changed into a prime (979509989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 303157 + ... + 306370.

It is an arithmetic number, because the mean of its divisors is an integer number (245030256).

Almost surely, 2^979509889 is an apocalyptic number.

It is an amenable number.

979509889 is a deficient number, since it is larger than the sum of its proper divisors (611135).

979509889 is a wasteful number, since it uses less digits than its factorization.

979509889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611134.

The product of its (nonzero) digits is 14696640, while the sum is 64.

The square root of 979509889 is about 31297.1226952255. The cubic root of 979509889 is about 993.1227752013.

The spelling of 979509889 in words is "nine hundred seventy-nine million, five hundred nine thousand, eight hundred eighty-nine".