63719861 has 2 divisors, whose sum is σ = 63719862. Its totient is φ = 63719860.

The previous prime is 63719819. The next prime is 63719869. The reversal of 63719861 is 16891736.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52200625 + 11519236 = 7225^2 + 3394^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63719861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63719869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31859930 + 31859931.

It is an arithmetic number, because the mean of its divisors is an integer number (31859931).

Almost surely, 2^63719861 is an apocalyptic number.

It is an amenable number.

63719861 is a deficient number, since it is larger than the sum of its proper divisors (1).

63719861 is an equidigital number, since it uses as much as digits as its factorization.

63719861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 41.

The square root of 63719861 is about 7982.4721108188. The cubic root of 63719861 is about 399.4155234673.

The spelling of 63719861 in words is "sixty-three million, seven hundred nineteen thousand, eight hundred sixty-one".