913663021 has 2 divisors, whose sum is σ = 913663022. Its totient is φ = 913663020.

The previous prime is 913662989. The next prime is 913663027. The reversal of 913663021 is 120366319.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 474760521 + 438902500 = 21789^2 + 20950^2 .

It is a cyclic number.

It is not a de Polignac number, because 913663021 - 2⁵ = 913662989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (913663027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 456831510 + 456831511.

It is an arithmetic number, because the mean of its divisors is an integer number (456831511).

Almost surely, 2^913663021 is an apocalyptic number.

It is an amenable number.

913663021 is a deficient number, since it is larger than the sum of its proper divisors (1).

913663021 is an equidigital number, since it uses as much as digits as its factorization.

913663021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 913663021 is about 30226.8592645680. The cubic root of 913663021 is about 970.3506087224.

The spelling of 913663021 in words is "nine hundred thirteen million, six hundred sixty-three thousand, twenty-one".