1691461 has 2 divisors, whose sum is σ = 1691462. Its totient is φ = 1691460.

The previous prime is 1691441. The next prime is 1691479. The reversal of 1691461 is 1641961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1366561 + 324900 = 1169^2 + 570^2 .

It is a cyclic number.

It is not a de Polignac number, because 1691461 - 2⁵ = 1691429 is a prime.

It is a super-2 number, since 2×1691461² = 5722080629042, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

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, 845730 + 845731.

It is an arithmetic number, because the mean of its divisors is an integer number (845731).

2^1691461 is an apocalyptic number.

It is an amenable number.

1691461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1691461 is an equidigital number, since it uses as much as digits as its factorization.

1691461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 28.

The square root of 1691461 is about 1300.5618016842. The cubic root of 1691461 is about 119.1481571547.

The spelling of 1691461 in words is "one million, six hundred ninety-one thousand, four hundred sixty-one".