1979291189 has 4 divisors (see below), whose sum is σ = 1980327756. Its totient is φ = 1978254624.

The previous prime is 1979291179. The next prime is 1979291191. The reversal of 1979291189 is 9811929791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9811929791 = 46141 ⋅212651.

It can be written as a sum of positive squares in 2 ways, for example, as 983888689 + 995402500 = 31367^2 + 31550^2 .

It is a cyclic number.

It is not a de Polignac number, because 1979291189 - 2⁴ = 1979291173 is a prime.

It is a super-2 number, since 2×1979291189² = 7835187221706067442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979291159) 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, 515414 + ... + 519239.

It is an arithmetic number, because the mean of its divisors is an integer number (495081939).

Almost surely, 2^1979291189 is an apocalyptic number.

It is an amenable number.

1979291189 is a deficient number, since it is larger than the sum of its proper divisors (1036567).

1979291189 is a wasteful number, since it uses less digits than its factorization.

1979291189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1036566.

The product of its digits is 734832, while the sum is 56.

The square root of 1979291189 is about 44489.2255383256. The cubic root of 1979291189 is about 1255.5573761604.

The spelling of 1979291189 in words is "one billion, nine hundred seventy-nine million, two hundred ninety-one thousand, one hundred eighty-nine".