690895489 has 2 divisors, whose sum is σ = 690895490. Its totient is φ = 690895488.

The previous prime is 690895463. The next prime is 690895493. The reversal of 690895489 is 984598096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 492085489 + 198810000 = 22183^2 + 14100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690895489 is a prime.

It is not a weakly prime, because it can be changed into another prime (690895409) 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, 345447744 + 345447745.

It is an arithmetic number, because the mean of its divisors is an integer number (345447745).

Almost surely, 2^690895489 is an apocalyptic number.

It is an amenable number.

690895489 is a deficient number, since it is larger than the sum of its proper divisors (1).

690895489 is an equidigital number, since it uses as much as digits as its factorization.

690895489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5598720, while the sum is 58.

The square root of 690895489 is about 26284.8908881129. The cubic root of 690895489 is about 884.0376993846.

The spelling of 690895489 in words is "six hundred ninety million, eight hundred ninety-five thousand, four hundred eighty-nine".