690716591 has 2 divisors, whose sum is σ = 690716592. Its totient is φ = 690716590.

The previous prime is 690716581. The next prime is 690716623. The reversal of 690716591 is 195617096.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 690716591 - 2²⁶ = 623607727 is a prime.

It is a super-2 number, since 2×690716591² = 954178818165322562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690716531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345358295 + 345358296.

It is an arithmetic number, because the mean of its divisors is an integer number (345358296).

Almost surely, 2^690716591 is an apocalyptic number.

690716591 is a deficient number, since it is larger than the sum of its proper divisors (1).

690716591 is an equidigital number, since it uses as much as digits as its factorization.

690716591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 690716591 is about 26281.4876101030. The cubic root of 690716591 is about 883.9613896140.

The spelling of 690716591 in words is "six hundred ninety million, seven hundred sixteen thousand, five hundred ninety-one".