1963681651 has 2 divisors, whose sum is σ = 1963681652. Its totient is φ = 1963681650.

The previous prime is 1963681637. The next prime is 1963681661. The reversal of 1963681651 is 1561863691.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1963681651 - 2⁷ = 1963681523 is a prime.

It is not a weakly prime, because it can be changed into another prime (1963681661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 981840825 + 981840826.

It is an arithmetic number, because the mean of its divisors is an integer number (981840826).

Almost surely, 2^1963681651 is an apocalyptic number.

1963681651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1963681651 is an equidigital number, since it uses as much as digits as its factorization.

1963681651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 46.

The square root of 1963681651 is about 44313.4477444489. The cubic root of 1963681651 is about 1252.2480401753.

The spelling of 1963681651 in words is "one billion, nine hundred sixty-three million, six hundred eighty-one thousand, six hundred fifty-one".