63974681 has 2 divisors, whose sum is σ = 63974682. Its totient is φ = 63974680.

The previous prime is 63974671. The next prime is 63974693. The reversal of 63974681 is 18647936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34987225 + 28987456 = 5915^2 + 5384^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63974681 is a prime.

It is a super-2 number, since 2×63974681² = 8185519618103522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (63974671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31987340 + 31987341.

It is an arithmetic number, because the mean of its divisors is an integer number (31987341).

Almost surely, 2^63974681 is an apocalyptic number.

It is an amenable number.

63974681 is a deficient number, since it is larger than the sum of its proper divisors (1).

63974681 is an equidigital number, since it uses as much as digits as its factorization.

63974681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 44.

The square root of 63974681 is about 7998.4174059623. The cubic root of 63974681 is about 399.9472451259.

The spelling of 63974681 in words is "sixty-three million, nine hundred seventy-four thousand, six hundred eighty-one".