690649319 has 2 divisors, whose sum is σ = 690649320. Its totient is φ = 690649318.

The previous prime is 690649301. The next prime is 690649321. The reversal of 690649319 is 913946096.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 690649319 - 2²⁸ = 422213863 is a prime.

It is a super-2 number, since 2×690649319² = 953992963670327522, which contains 22 as substring.

Together with 690649321, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690640319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345324659 + 345324660.

It is an arithmetic number, because the mean of its divisors is an integer number (345324660).

Almost surely, 2^690649319 is an apocalyptic number.

690649319 is a deficient number, since it is larger than the sum of its proper divisors (1).

690649319 is an equidigital number, since it uses as much as digits as its factorization.

690649319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 47.

The square root of 690649319 is about 26280.2077427101. The cubic root of 690649319 is about 883.9326910218.

The spelling of 690649319 in words is "six hundred ninety million, six hundred forty-nine thousand, three hundred nineteen".