1690687919 has 2 divisors, whose sum is σ = 1690687920. Its totient is φ = 1690687918.

The previous prime is 1690687871. The next prime is 1690687937. The reversal of 1690687919 is 9197860961.

It is a strong prime.

It is an emirp because it is prime and its reverse (9197860961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1690687919 - 2²⁴ = 1673910703 is a prime.

It is a super-2 number, since 2×1690687919² = 5716851278905101122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1690687949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845343959 + 845343960.

It is an arithmetic number, because the mean of its divisors is an integer number (845343960).

Almost surely, 2^1690687919 is an apocalyptic number.

1690687919 is a deficient number, since it is larger than the sum of its proper divisors (1).

1690687919 is an equidigital number, since it uses as much as digits as its factorization.

1690687919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 56.

The square root of 1690687919 is about 41117.9756189431. The cubic root of 1690687919 is about 1191.3000219615.

The spelling of 1690687919 in words is "one billion, six hundred ninety million, six hundred eighty-seven thousand, nine hundred nineteen".