690636497 has 2 divisors, whose sum is σ = 690636498. Its totient is φ = 690636496.

The previous prime is 690636467. The next prime is 690636503. The reversal of 690636497 is 794636096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 599319361 + 91317136 = 24481^2 + 9556^2 .

It is a cyclic number.

It is not a de Polignac number, because 690636497 - 2¹² = 690632401 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (690636437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345318248 + 345318249.

It is an arithmetic number, because the mean of its divisors is an integer number (345318249).

Almost surely, 2^690636497 is an apocalyptic number.

It is an amenable number.

690636497 is a deficient number, since it is larger than the sum of its proper divisors (1).

690636497 is an equidigital number, since it uses as much as digits as its factorization.

690636497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1469664, while the sum is 50.

The square root of 690636497 is about 26279.9637937346. The cubic root of 690636497 is about 883.9272208771.

The spelling of 690636497 in words is "six hundred ninety million, six hundred thirty-six thousand, four hundred ninety-seven".