1979988961 has 2 divisors, whose sum is σ = 1979988962. Its totient is φ = 1979988960.

The previous prime is 1979988937. The next prime is 1979988977. The reversal of 1979988961 is 1698899791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1951430625 + 28558336 = 44175^2 + 5344^2 .

It is a cyclic number.

It is not a de Polignac number, because 1979988961 - 2¹¹ = 1979986913 is a prime.

It is not a weakly prime, because it can be changed into another prime (1979988931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989994480 + 989994481.

It is an arithmetic number, because the mean of its divisors is an integer number (989994481).

Almost surely, 2^1979988961 is an apocalyptic number.

It is an amenable number.

1979988961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1979988961 is an equidigital number, since it uses as much as digits as its factorization.

1979988961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17635968, while the sum is 67.

The square root of 1979988961 is about 44497.0668808631. The cubic root of 1979988961 is about 1255.7049020112.

The spelling of 1979988961 in words is "one billion, nine hundred seventy-nine million, nine hundred eighty-eight thousand, nine hundred sixty-one".