1691141 has 2 divisors, whose sum is σ = 1691142. Its totient is φ = 1691140.

The previous prime is 1691119. The next prime is 1691161. The reversal of 1691141 is 1411961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 863041 + 828100 = 929^2 + 910^2 .

It is an emirp because it is prime and its reverse (1411961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1691141 - 2¹⁸ = 1428997 is a prime.

It is equal to p₁₂₇₅₀₈ and since 1691141 and 127508 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1691101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845570 + 845571.

It is an arithmetic number, because the mean of its divisors is an integer number (845571).

2^1691141 is an apocalyptic number.

It is an amenable number.

1691141 is a deficient number, since it is larger than the sum of its proper divisors (1).

1691141 is an equidigital number, since it uses as much as digits as its factorization.

1691141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 23.

The square root of 1691141 is about 1300.4387721073. The cubic root of 1691141 is about 119.1406429772.

The spelling of 1691141 in words is "one million, six hundred ninety-one thousand, one hundred forty-one".