689772697 has 2 divisors, whose sum is σ = 689772698. Its totient is φ = 689772696.

The previous prime is 689772641. The next prime is 689772701. The reversal of 689772697 is 796277986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 548543241 + 141229456 = 23421^2 + 11884^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689772697 is a prime.

It is not a weakly prime, because it can be changed into another prime (689772617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344886348 + 344886349.

It is an arithmetic number, because the mean of its divisors is an integer number (344886349).

Almost surely, 2^689772697 is an apocalyptic number.

It is an amenable number.

689772697 is a deficient number, since it is larger than the sum of its proper divisors (1).

689772697 is an equidigital number, since it uses as much as digits as its factorization.

689772697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16003008, while the sum is 61.

The square root of 689772697 is about 26263.5240780821. The cubic root of 689772697 is about 883.5585489423.

The spelling of 689772697 in words is "six hundred eighty-nine million, seven hundred seventy-two thousand, six hundred ninety-seven".