689969519 has 2 divisors, whose sum is σ = 689969520. Its totient is φ = 689969518.

The previous prime is 689969507. The next prime is 689969549. The reversal of 689969519 is 915969986.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 689969519 - 2¹⁶ = 689903983 is a prime.

It is a super-2 number, since 2×689969519² = 952115874298182722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689969549) 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, 344984759 + 344984760.

It is an arithmetic number, because the mean of its divisors is an integer number (344984760).

Almost surely, 2^689969519 is an apocalyptic number.

689969519 is a deficient number, since it is larger than the sum of its proper divisors (1).

689969519 is an equidigital number, since it uses as much as digits as its factorization.

689969519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9447840, while the sum is 62.

The square root of 689969519 is about 26267.2708708004. The cubic root of 689969519 is about 883.6425801134.

The spelling of 689969519 in words is "six hundred eighty-nine million, nine hundred sixty-nine thousand, five hundred nineteen".