690986459 has 2 divisors, whose sum is σ = 690986460. Its totient is φ = 690986458.

The previous prime is 690986453. The next prime is 690986501. The reversal of 690986459 is 954689096.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 690986459 - 2²⁰ = 689937883 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (690986453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345493229 + 345493230.

It is an arithmetic number, because the mean of its divisors is an integer number (345493230).

Almost surely, 2^690986459 is an apocalyptic number.

690986459 is a deficient number, since it is larger than the sum of its proper divisors (1).

690986459 is an equidigital number, since it uses as much as digits as its factorization.

690986459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4199040, while the sum is 56.

The square root of 690986459 is about 26286.6212929695. The cubic root of 690986459 is about 884.0764980072.

It can be divided in two parts, 69098 and 6459, that added together give a palindrome (75557).

The spelling of 690986459 in words is "six hundred ninety million, nine hundred eighty-six thousand, four hundred fifty-nine".