1963814981 has 2 divisors, whose sum is σ = 1963814982. Its totient is φ = 1963814980.

The previous prime is 1963814971. The next prime is 1963815023. The reversal of 1963814981 is 1894183691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1426270756 + 537544225 = 37766^2 + 23185^2 .

It is a cyclic number.

It is not a de Polignac number, because 1963814981 - 2¹⁸ = 1963552837 is a prime.

It is a super-2 number, since 2×1963814981² = 7713138559200060722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1963814971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 981907490 + 981907491.

It is an arithmetic number, because the mean of its divisors is an integer number (981907491).

Almost surely, 2^1963814981 is an apocalyptic number.

It is an amenable number.

1963814981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1963814981 is an equidigital number, since it uses as much as digits as its factorization.

1963814981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 50.

The square root of 1963814981 is about 44314.9521155106. The cubic root of 1963814981 is about 1252.2763812343.

The spelling of 1963814981 in words is "one billion, nine hundred sixty-three million, eight hundred fourteen thousand, nine hundred eighty-one".