63436621 has 2 divisors, whose sum is σ = 63436622. Its totient is φ = 63436620.

The previous prime is 63436579. The next prime is 63436631. The reversal of 63436621 is 12663436.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36542025 + 26894596 = 6045^2 + 5186^2 .

It is a cyclic number.

It is not a de Polignac number, because 63436621 - 2²¹ = 61339469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63436631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31718310 + 31718311.

It is an arithmetic number, because the mean of its divisors is an integer number (31718311).

Almost surely, 2^63436621 is an apocalyptic number.

It is an amenable number.

63436621 is a deficient number, since it is larger than the sum of its proper divisors (1).

63436621 is an equidigital number, since it uses as much as digits as its factorization.

63436621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 31.

The square root of 63436621 is about 7964.7109803181. The cubic root of 63436621 is about 398.8228328421.

The spelling of 63436621 in words is "sixty-three million, four hundred thirty-six thousand, six hundred twenty-one".