689319331 has 2 divisors, whose sum is σ = 689319332. Its totient is φ = 689319330.

The previous prime is 689319307. The next prime is 689319403. The reversal of 689319331 is 133913986.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689319331 is a prime.

It is a super-2 number, since 2×689319331² = 950322280180575122, which contains 22 as substring.

It is equal to p_35728288 and since 689319331 and 35728288 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (689310331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344659665 + 344659666.

It is an arithmetic number, because the mean of its divisors is an integer number (344659666).

Almost surely, 2^689319331 is an apocalyptic number.

689319331 is a deficient number, since it is larger than the sum of its proper divisors (1).

689319331 is an equidigital number, since it uses as much as digits as its factorization.

689319331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 43.

The square root of 689319331 is about 26254.8915632878. The cubic root of 689319331 is about 883.3649280578.

The spelling of 689319331 in words is "six hundred eighty-nine million, three hundred nineteen thousand, three hundred thirty-one".