1944979961 has 2 divisors, whose sum is σ = 1944979962. Its totient is φ = 1944979960.

The previous prime is 1944979847. The next prime is 1944979969. The reversal of 1944979961 is 1699794491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1705690000 + 239289961 = 41300^2 + 15469^2 .

It is a cyclic number.

It is not a de Polignac number, because 1944979961 - 2¹⁴ = 1944963577 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1944979961.

It is not a weakly prime, because it can be changed into another prime (1944979969) 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 as a sum of consecutive naturals, namely, 972489980 + 972489981.

It is an arithmetic number, because the mean of its divisors is an integer number (972489981).

Almost surely, 2^1944979961 is an apocalyptic number.

It is an amenable number.

1944979961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1944979961 is an equidigital number, since it uses as much as digits as its factorization.

1944979961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4408992, while the sum is 59.

The square root of 1944979961 is about 44101.9269533657. The cubic root of 1944979961 is about 1248.2599706422.

The spelling of 1944979961 in words is "one billion, nine hundred forty-four million, nine hundred seventy-nine thousand, nine hundred sixty-one".