608644691 has 2 divisors, whose sum is σ = 608644692. Its totient is φ = 608644690.

The previous prime is 608644681. The next prime is 608644717. The reversal of 608644691 is 196446806.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 608644691 - 2⁶ = 608644627 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (608644601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304322345 + 304322346.

It is an arithmetic number, because the mean of its divisors is an integer number (304322346).

Almost surely, 2^608644691 is an apocalyptic number.

608644691 is a deficient number, since it is larger than the sum of its proper divisors (1).

608644691 is an equidigital number, since it uses as much as digits as its factorization.

608644691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 608644691 is about 24670.7253845524. The cubic root of 608644691 is about 847.4640406134.

The spelling of 608644691 in words is "six hundred eight million, six hundred forty-four thousand, six hundred ninety-one".