916596721 has 2 divisors, whose sum is σ = 916596722. Its totient is φ = 916596720.

The previous prime is 916596673. The next prime is 916596757. The reversal of 916596721 is 127695619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 870899121 + 45697600 = 29511^2 + 6760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-916596721 is a prime.

It is not a weakly prime, because it can be changed into another prime (916596761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 458298360 + 458298361.

It is an arithmetic number, because the mean of its divisors is an integer number (458298361).

Almost surely, 2^916596721 is an apocalyptic number.

It is an amenable number.

916596721 is a deficient number, since it is larger than the sum of its proper divisors (1).

916596721 is an equidigital number, since it uses as much as digits as its factorization.

916596721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 46.

The square root of 916596721 is about 30275.3484042711. The cubic root of 916596721 is about 971.3880722354.

The spelling of 916596721 in words is "nine hundred sixteen million, five hundred ninety-six thousand, seven hundred twenty-one".