690566291 has 2 divisors, whose sum is σ = 690566292. Its totient is φ = 690566290.

The previous prime is 690566287. The next prime is 690566311. The reversal of 690566291 is 192665096.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 690566291 - 2² = 690566287 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (690566221) 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, 345283145 + 345283146.

It is an arithmetic number, because the mean of its divisors is an integer number (345283146).

Almost surely, 2^690566291 is an apocalyptic number.

690566291 is a deficient number, since it is larger than the sum of its proper divisors (1).

690566291 is an equidigital number, since it uses as much as digits as its factorization.

690566291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 174960, while the sum is 44.

The square root of 690566291 is about 26278.6280273533. The cubic root of 690566291 is about 883.8972682669.

The spelling of 690566291 in words is "six hundred ninety million, five hundred sixty-six thousand, two hundred ninety-one".