690181073 has 2 divisors, whose sum is σ = 690181074. Its totient is φ = 690181072.

The previous prime is 690181069. The next prime is 690181081. The reversal of 690181073 is 370181096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 620408464 + 69772609 = 24908^2 + 8353^2 .

It is a cyclic number.

It is not a de Polignac number, because 690181073 - 2² = 690181069 is a prime.

It is not a weakly prime, because it can be changed into another prime (690181043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345090536 + 345090537.

It is an arithmetic number, because the mean of its divisors is an integer number (345090537).

Almost surely, 2^690181073 is an apocalyptic number.

It is an amenable number.

690181073 is a deficient number, since it is larger than the sum of its proper divisors (1).

690181073 is an equidigital number, since it uses as much as digits as its factorization.

690181073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 690181073 is about 26271.2975126848. The cubic root of 690181073 is about 883.7328831460.

The spelling of 690181073 in words is "six hundred ninety million, one hundred eighty-one thousand, seventy-three".