1691119613 has 2 divisors, whose sum is σ = 1691119614. Its totient is φ = 1691119612.

The previous prime is 1691119561. The next prime is 1691119627. The reversal of 1691119613 is 3169111961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1623928804 + 67190809 = 40298^2 + 8197^2 .

It is an emirp because it is prime and its reverse (3169111961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1691119613 - 2⁸ = 1691119357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1691119663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845559806 + 845559807.

It is an arithmetic number, because the mean of its divisors is an integer number (845559807).

Almost surely, 2^1691119613 is an apocalyptic number.

It is an amenable number.

1691119613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1691119613 is an equidigital number, since it uses as much as digits as its factorization.

1691119613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 38.

The square root of 1691119613 is about 41123.2247397988. The cubic root of 1691119613 is about 1191.4014073800.

The spelling of 1691119613 in words is "one billion, six hundred ninety-one million, one hundred nineteen thousand, six hundred thirteen".