1980514961 has 2 divisors, whose sum is σ = 1980514962. Its totient is φ = 1980514960.

The previous prime is 1980514937. The next prime is 1980514969. The reversal of 1980514961 is 1694150891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1406625025 + 573889936 = 37505^2 + 23956^2 .

It is an emirp because it is prime and its reverse (1694150891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1980514961 - 2¹⁸ = 1980252817 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1980514969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990257480 + 990257481.

It is an arithmetic number, because the mean of its divisors is an integer number (990257481).

Almost surely, 2^1980514961 is an apocalyptic number.

It is an amenable number.

1980514961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980514961 is an equidigital number, since it uses as much as digits as its factorization.

1980514961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 44.

The square root of 1980514961 is about 44502.9769903093. The cubic root of 1980514961 is about 1255.8160882032.

The spelling of 1980514961 in words is "one billion, nine hundred eighty million, five hundred fourteen thousand, nine hundred sixty-one".