913337921 has 2 divisors, whose sum is σ = 913337922. Its totient is φ = 913337920.

The previous prime is 913337879. The next prime is 913337941. The reversal of 913337921 is 129733319.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 835210000 + 78127921 = 28900^2 + 8839^2 .

It is an emirp because it is prime and its reverse (129733319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 913337921 - 2⁶ = 913337857 is a prime.

It is not a weakly prime, because it can be changed into another prime (913337941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 456668960 + 456668961.

It is an arithmetic number, because the mean of its divisors is an integer number (456668961).

Almost surely, 2^913337921 is an apocalyptic number.

It is an amenable number.

913337921 is a deficient number, since it is larger than the sum of its proper divisors (1).

913337921 is an equidigital number, since it uses as much as digits as its factorization.

913337921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30618, while the sum is 38.

The square root of 913337921 is about 30221.4811185686. The cubic root of 913337921 is about 970.2355048680.

The spelling of 913337921 in words is "nine hundred thirteen million, three hundred thirty-seven thousand, nine hundred twenty-one".