63320981 has 2 divisors, whose sum is σ = 63320982. Its totient is φ = 63320980.

The previous prime is 63320953. The next prime is 63320993. The reversal of 63320981 is 18902336.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60310756 + 3010225 = 7766^2 + 1735^2 .

It is a cyclic number.

It is not a de Polignac number, because 63320981 - 2¹⁴ = 63304597 is a prime.

It is a super-2 number, since 2×63320981² = 8019093269604722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63320911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31660490 + 31660491.

It is an arithmetic number, because the mean of its divisors is an integer number (31660491).

Almost surely, 2^63320981 is an apocalyptic number.

It is an amenable number.

63320981 is a deficient number, since it is larger than the sum of its proper divisors (1).

63320981 is an equidigital number, since it uses as much as digits as its factorization.

63320981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 63320981 is about 7957.4481462338. The cubic root of 63320981 is about 398.5803444898.

The spelling of 63320981 in words is "sixty-three million, three hundred twenty thousand, nine hundred eighty-one".