690181069 has 2 divisors, whose sum is σ = 690181070. Its totient is φ = 690181068.

The previous prime is 690181067. The next prime is 690181073. The reversal of 690181069 is 960181096.

690181069 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 570015625 + 120165444 = 23875^2 + 10962^2 .

It is a cyclic number.

It is not a de Polignac number, because 690181069 - 2¹ = 690181067 is a prime.

It is a super-2 number, since 2×690181069² = 952699816011965522, which contains 22 as substring.

Together with 690181067, it forms a pair of twin primes.

It is a Chen prime.

690181069 is a strobogrammatic number because it is the same when read upside-down.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690181067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345090534 + 345090535.

It is an arithmetic number, because the mean of its divisors is an integer number (345090535).

Almost surely, 2^690181069 is an apocalyptic number.

It is an amenable number.

690181069 is a deficient number, since it is larger than the sum of its proper divisors (1).

690181069 is an equidigital number, since it uses as much as digits as its factorization.

690181069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 690181069 is about 26271.2974365561. The cubic root of 690181069 is about 883.7328814387.

The spelling of 690181069 in words is "six hundred ninety million, one hundred eighty-one thousand, sixty-nine".