1979675209 has 2 divisors, whose sum is σ = 1979675210. Its totient is φ = 1979675208.

The previous prime is 1979675207. The next prime is 1979675213. The reversal of 1979675209 is 9025769791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1292186809 + 687488400 = 35947^2 + 26220^2 .

It is a cyclic number.

It is not a de Polignac number, because 1979675209 - 2¹ = 1979675207 is a prime.

It is a super-2 number, since 2×1979675209² = 7838227866258387362, which contains 22 as substring.

Together with 1979675207, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1979675209.

It is not a weakly prime, because it can be changed into another prime (1979675207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989837604 + 989837605.

It is an arithmetic number, because the mean of its divisors is an integer number (989837605).

Almost surely, 2^1979675209 is an apocalyptic number.

It is an amenable number.

1979675209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1979675209 is an equidigital number, since it uses as much as digits as its factorization.

1979675209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2143260, while the sum is 55.

The square root of 1979675209 is about 44493.5412054379. The cubic root of 1979675209 is about 1255.6385715511.

The spelling of 1979675209 in words is "one billion, nine hundred seventy-nine million, six hundred seventy-five thousand, two hundred nine".