690538799 has 2 divisors, whose sum is σ = 690538800. Its totient is φ = 690538798.

The previous prime is 690538757. The next prime is 690538811. The reversal of 690538799 is 997835096.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 690538799 - 2⁸ = 690538543 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690538099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345269399 + 345269400.

It is an arithmetic number, because the mean of its divisors is an integer number (345269400).

Almost surely, 2^690538799 is an apocalyptic number.

690538799 is a deficient number, since it is larger than the sum of its proper divisors (1).

690538799 is an equidigital number, since it uses as much as digits as its factorization.

690538799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3674160, while the sum is 56.

The square root of 690538799 is about 26278.1049354781. The cubic root of 690538799 is about 883.8855385573.

The spelling of 690538799 in words is "six hundred ninety million, five hundred thirty-eight thousand, seven hundred ninety-nine".