690109859 has 2 divisors, whose sum is σ = 690109860. Its totient is φ = 690109858.

The previous prime is 690109853. The next prime is 690109913. The reversal of 690109859 is 958901096.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 690109859 - 2⁸ = 690109603 is a prime.

It is not a weakly prime, because it can be changed into another prime (690109853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345054929 + 345054930.

It is an arithmetic number, because the mean of its divisors is an integer number (345054930).

Almost surely, 2^690109859 is an apocalyptic number.

690109859 is a deficient number, since it is larger than the sum of its proper divisors (1).

690109859 is an equidigital number, since it uses as much as digits as its factorization.

690109859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 47.

The square root of 690109859 is about 26269.9421202255. The cubic root of 690109859 is about 883.7024871042.

The spelling of 690109859 in words is "six hundred ninety million, one hundred nine thousand, eight hundred fifty-nine".