1963840913 has 2 divisors, whose sum is σ = 1963840914. Its totient is φ = 1963840912.

The previous prime is 1963840909. The next prime is 1963840927. The reversal of 1963840913 is 3190483691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1465970944 + 497869969 = 38288^2 + 22313^2 .

It is a cyclic number.

It is not a de Polignac number, because 1963840913 - 2² = 1963840909 is a prime.

It is a super-2 number, since 2×1963840913² = 7713342263145347138, which contains 22 as substring.

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 (1963840973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 981920456 + 981920457.

It is an arithmetic number, because the mean of its divisors is an integer number (981920457).

Almost surely, 2^1963840913 is an apocalyptic number.

It is an amenable number.

1963840913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1963840913 is an equidigital number, since it uses as much as digits as its factorization.

1963840913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 1963840913 is about 44315.2447020210. The cubic root of 1963840913 is about 1252.2818932757.

The spelling of 1963840913 in words is "one billion, nine hundred sixty-three million, eight hundred forty thousand, nine hundred thirteen".