689772617 has 2 divisors, whose sum is σ = 689772618. Its totient is φ = 689772616.

The previous prime is 689772613. The next prime is 689772631. The reversal of 689772617 is 716277986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 689640121 + 132496 = 26261^2 + 364^2 .

It is a cyclic number.

It is not a de Polignac number, because 689772617 - 2² = 689772613 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (689772613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344886308 + 344886309.

It is an arithmetic number, because the mean of its divisors is an integer number (344886309).

Almost surely, 2^689772617 is an apocalyptic number.

It is an amenable number.

689772617 is a deficient number, since it is larger than the sum of its proper divisors (1).

689772617 is an equidigital number, since it uses as much as digits as its factorization.

689772617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1778112, while the sum is 53.

The square root of 689772617 is about 26263.5225550572. The cubic root of 689772617 is about 883.5585147839.

The spelling of 689772617 in words is "six hundred eighty-nine million, seven hundred seventy-two thousand, six hundred seventeen".