63623981 has 2 divisors, whose sum is σ = 63623982. Its totient is φ = 63623980.

The previous prime is 63623921. The next prime is 63624073. The reversal of 63623981 is 18932636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34409956 + 29214025 = 5866^2 + 5405^2 .

It is a cyclic number.

It is not a de Polignac number, because 63623981 - 2¹⁴ = 63607597 is a prime.

It is a super-2 number, since 2×63623981² = 8096021916576722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63623921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31811990 + 31811991.

It is an arithmetic number, because the mean of its divisors is an integer number (31811991).

Almost surely, 2^63623981 is an apocalyptic number.

It is an amenable number.

63623981 is a deficient number, since it is larger than the sum of its proper divisors (1).

63623981 is an equidigital number, since it uses as much as digits as its factorization.

63623981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 38.

The square root of 63623981 is about 7976.4641916077. The cubic root of 63623981 is about 399.2150878732.

The spelling of 63623981 in words is "sixty-three million, six hundred twenty-three thousand, nine hundred eighty-one".