1690408241 has 2 divisors, whose sum is σ = 1690408242. Its totient is φ = 1690408240.

The previous prime is 1690408219. The next prime is 1690408249. The reversal of 1690408241 is 1428040961.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1607689216 + 82719025 = 40096^2 + 9095^2 .

It is a cyclic number.

It is not a de Polignac number, because 1690408241 - 2⁶ = 1690408177 is a prime.

It is not a weakly prime, because it can be changed into another prime (1690408249) 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, 845204120 + 845204121.

It is an arithmetic number, because the mean of its divisors is an integer number (845204121).

Almost surely, 2^1690408241 is an apocalyptic number.

It is an amenable number.

1690408241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1690408241 is an equidigital number, since it uses as much as digits as its factorization.

1690408241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 1690408241 is about 41114.5745569622. The cubic root of 1690408241 is about 1191.2343290213.

The spelling of 1690408241 in words is "one billion, six hundred ninety million, four hundred eight thousand, two hundred forty-one".