690243097 has 2 divisors, whose sum is σ = 690243098. Its totient is φ = 690243096.

The previous prime is 690243083. The next prime is 690243101. The reversal of 690243097 is 790342096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 551498256 + 138744841 = 23484^2 + 11779^2 .

It is a cyclic number.

It is not a de Polignac number, because 690243097 - 2²³ = 681854489 is a prime.

It is not a weakly prime, because it can be changed into another prime (690243017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345121548 + 345121549.

It is an arithmetic number, because the mean of its divisors is an integer number (345121549).

Almost surely, 2^690243097 is an apocalyptic number.

It is an amenable number.

690243097 is a deficient number, since it is larger than the sum of its proper divisors (1).

690243097 is an equidigital number, since it uses as much as digits as its factorization.

690243097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 690243097 is about 26272.4779379487. The cubic root of 690243097 is about 883.7593549462.

The spelling of 690243097 in words is "six hundred ninety million, two hundred forty-three thousand, ninety-seven".