63994421 has 2 divisors, whose sum is σ = 63994422. Its totient is φ = 63994420.

The previous prime is 63994397. The next prime is 63994433. The reversal of 63994421 is 12449936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46771921 + 17222500 = 6839^2 + 4150^2 .

It is a cyclic number.

It is not a de Polignac number, because 63994421 - 2¹⁴ = 63978037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63994121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31997210 + 31997211.

It is an arithmetic number, because the mean of its divisors is an integer number (31997211).

Almost surely, 2^63994421 is an apocalyptic number.

It is an amenable number.

63994421 is a deficient number, since it is larger than the sum of its proper divisors (1).

63994421 is an equidigital number, since it uses as much as digits as its factorization.

63994421 is an evil number, because the sum of its binary digits is even.

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

The square root of 63994421 is about 7999.6513049007. The cubic root of 63994421 is about 399.9883767456.

The spelling of 63994421 in words is "sixty-three million, nine hundred ninety-four thousand, four hundred twenty-one".