2197509979 has 4 divisors (see below), whose sum is σ = 2511439984. Its totient is φ = 1883579976.

The previous prime is 2197509949. The next prime is 2197509997. The reversal of 2197509979 is 9799057912.

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 2197509979 - 2¹⁷ = 2197378907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2197509949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156964992 + ... + 156965005.

It is an arithmetic number, because the mean of its divisors is an integer number (627859996).

Almost surely, 2^2197509979 is an apocalyptic number.

2197509979 is a deficient number, since it is larger than the sum of its proper divisors (313930005).

2197509979 is an equidigital number, since it uses as much as digits as its factorization.

2197509979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313930004.

The product of its (nonzero) digits is 3214890, while the sum is 58.

The square root of 2197509979 is about 46877.6063702062. The cubic root of 2197509979 is about 1300.1005797920.

The spelling of 2197509979 in words is "two billion, one hundred ninety-seven million, five hundred nine thousand, nine hundred seventy-nine".