689151791 has 4 divisors (see below), whose sum is σ = 692011584. Its totient is φ = 686292000.

The previous prime is 689151779. The next prime is 689151809. The reversal of 689151791 is 197151986.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689151791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689151721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1429535 + ... + 1430016.

It is an arithmetic number, because the mean of its divisors is an integer number (173002896).

Almost surely, 2^689151791 is an apocalyptic number.

689151791 is a deficient number, since it is larger than the sum of its proper divisors (2859793).

689151791 is a wasteful number, since it uses less digits than its factorization.

689151791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2859792.

The product of its digits is 136080, while the sum is 47.

The square root of 689151791 is about 26251.7007258577. The cubic root of 689151791 is about 883.2933545768.

The spelling of 689151791 in words is "six hundred eighty-nine million, one hundred fifty-one thousand, seven hundred ninety-one".