1690990207 has 2 divisors, whose sum is σ = 1690990208. Its totient is φ = 1690990206.

The previous prime is 1690990157. The next prime is 1690990219. The reversal of 1690990207 is 7020990961.

It is a strong prime.

It is an emirp because it is prime and its reverse (7020990961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1690990207 - 2⁷ = 1690990079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1690990297) 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, 845495103 + 845495104.

It is an arithmetic number, because the mean of its divisors is an integer number (845495104).

Almost surely, 2^1690990207 is an apocalyptic number.

1690990207 is a deficient number, since it is larger than the sum of its proper divisors (1).

1690990207 is an equidigital number, since it uses as much as digits as its factorization.

1690990207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61236, while the sum is 43.

The square root of 1690990207 is about 41121.6513165510. The cubic root of 1690990207 is about 1191.3710175676.

The spelling of 1690990207 in words is "one billion, six hundred ninety million, nine hundred ninety thousand, two hundred seven".