1691441 has 2 divisors, whose sum is σ = 1691442. Its totient is φ = 1691440.

The previous prime is 1691429. The next prime is 1691461. The reversal of 1691441 is 1441961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 874225 + 817216 = 935^2 + 904^2 .

It is a cyclic number.

It is not a de Polignac number, because 1691441 - 2¹⁴ = 1675057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1691441.

It is not a weakly prime, because it can be changed into another prime (1691401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845720 + 845721.

It is an arithmetic number, because the mean of its divisors is an integer number (845721).

2^1691441 is an apocalyptic number.

It is an amenable number.

1691441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1691441 is an equidigital number, since it uses as much as digits as its factorization.

1691441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The square root of 1691441 is about 1300.5541126766. The cubic root of 1691441 is about 119.1476875464.

The spelling of 1691441 in words is "one million, six hundred ninety-one thousand, four hundred forty-one".