689910499 has 2 divisors, whose sum is σ = 689910500. Its totient is φ = 689910498.

The previous prime is 689910469. The next prime is 689910563. The reversal of 689910499 is 994019986.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689910499 is a prime.

It is not a weakly prime, because it can be changed into another prime (689910469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344955249 + 344955250.

It is an arithmetic number, because the mean of its divisors is an integer number (344955250).

Almost surely, 2^689910499 is an apocalyptic number.

689910499 is a deficient number, since it is larger than the sum of its proper divisors (1).

689910499 is an equidigital number, since it uses as much as digits as its factorization.

689910499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1259712, while the sum is 55.

The square root of 689910499 is about 26266.1473954594. The cubic root of 689910499 is about 883.6173837964.

The spelling of 689910499 in words is "six hundred eighty-nine million, nine hundred ten thousand, four hundred ninety-nine".