2119978961 has 2 divisors, whose sum is σ = 2119978962. Its totient is φ = 2119978960.

The previous prime is 2119978957. The next prime is 2119978969. The reversal of 2119978961 is 1698799112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2108554561 + 11424400 = 45919^2 + 3380^2 .

It is a cyclic number.

It is not a de Polignac number, because 2119978961 - 2² = 2119978957 is a prime.

It is not a weakly prime, because it can be changed into another prime (2119978969) 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, 1059989480 + 1059989481.

It is an arithmetic number, because the mean of its divisors is an integer number (1059989481).

Almost surely, 2^2119978961 is an apocalyptic number.

It is an amenable number.

2119978961 is a deficient number, since it is larger than the sum of its proper divisors (1).

2119978961 is an equidigital number, since it uses as much as digits as its factorization.

2119978961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 53.

The square root of 2119978961 is about 46043.2292633781. The cubic root of 2119978961 is about 1284.6274081127.

The spelling of 2119978961 in words is "two billion, one hundred nineteen million, nine hundred seventy-eight thousand, nine hundred sixty-one".