1171661 has 2 divisors, whose sum is σ = 1171662. Its totient is φ = 1171660.

The previous prime is 1171637. The next prime is 1171669. The reversal of 1171661 is 1661711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1142761 + 28900 = 1069^2 + 170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1171661 is a prime.

It is a super-3 number, since 3×1171661³ = 4825331751285833343, which contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1171669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 585830 + 585831.

It is an arithmetic number, because the mean of its divisors is an integer number (585831).

2^1171661 is an apocalyptic number.

It is an amenable number.

1171661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1171661 is an equidigital number, since it uses as much as digits as its factorization.

1171661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 252, while the sum is 23.

The square root of 1171661 is about 1082.4329078516. The cubic root of 1171661 is about 105.4226651866.

The spelling of 1171661 in words is "one million, one hundred seventy-one thousand, six hundred sixty-one".