689772641 has 2 divisors, whose sum is σ = 689772642. Its totient is φ = 689772640.

The previous prime is 689772631. The next prime is 689772697. The reversal of 689772641 is 146277986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 498227041 + 191545600 = 22321^2 + 13840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689772641 is a prime.

It is a super-2 number, since 2×689772641² = 951572592544229762, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 689772641.

It is not a weakly prime, because it can be changed into another prime (689772631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344886320 + 344886321.

It is an arithmetic number, because the mean of its divisors is an integer number (344886321).

Almost surely, 2^689772641 is an apocalyptic number.

It is an amenable number.

689772641 is a deficient number, since it is larger than the sum of its proper divisors (1).

689772641 is an equidigital number, since it uses as much as digits as its factorization.

689772641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 50.

The square root of 689772641 is about 26263.5230119647. The cubic root of 689772641 is about 883.5585250314.

The spelling of 689772641 in words is "six hundred eighty-nine million, seven hundred seventy-two thousand, six hundred forty-one".