690543589 has 2 divisors, whose sum is σ = 690543590. Its totient is φ = 690543588.

The previous prime is 690543547. The next prime is 690543643. The reversal of 690543589 is 985345096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 689062500 + 1481089 = 26250^2 + 1217^2 .

It is a cyclic number.

It is not a de Polignac number, because 690543589 - 2⁷ = 690543461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690543289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345271794 + 345271795.

It is an arithmetic number, because the mean of its divisors is an integer number (345271795).

Almost surely, 2^690543589 is an apocalyptic number.

It is an amenable number.

690543589 is a deficient number, since it is larger than the sum of its proper divisors (1).

690543589 is an equidigital number, since it uses as much as digits as its factorization.

690543589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The square root of 690543589 is about 26278.1960758344. The cubic root of 690543589 is about 883.8875822764.

The spelling of 690543589 in words is "six hundred ninety million, five hundred forty-three thousand, five hundred eighty-nine".