1691419 has 2 divisors, whose sum is σ = 1691420. Its totient is φ = 1691418.

The previous prime is 1691413. The next prime is 1691423. The reversal of 1691419 is 9141961.

It is a strong prime.

It is an emirp because it is prime and its reverse (9141961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1691419 - 2³ = 1691411 is a prime.

It is a super-2 number, since 2×1691419² = 5721796467122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1691411) 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, 845709 + 845710.

It is an arithmetic number, because the mean of its divisors is an integer number (845710).

2^1691419 is an apocalyptic number.

1691419 is a deficient number, since it is larger than the sum of its proper divisors (1).

1691419 is an equidigital number, since it uses as much as digits as its factorization.

1691419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 31.

The square root of 1691419 is about 1300.5456547157. The cubic root of 1691419 is about 119.1471709730.

The spelling of 1691419 in words is "one million, six hundred ninety-one thousand, four hundred nineteen".