1159661 has 2 divisors, whose sum is σ = 1159662. Its totient is φ = 1159660.

The previous prime is 1159649. The next prime is 1159663. The reversal of 1159661 is 1669511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1142761 + 16900 = 1069^2 + 130^2 .

It is a cyclic number.

It is not a de Polignac number, because 1159661 - 2⁶ = 1159597 is a prime.

It is a Sophie Germain prime.

Together with 1159663, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1159663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 579830 + 579831.

It is an arithmetic number, because the mean of its divisors is an integer number (579831).

2^1159661 is an apocalyptic number.

It is an amenable number.

1159661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1159661 is an equidigital number, since it uses as much as digits as its factorization.

1159661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620, while the sum is 29.

The square root of 1159661 is about 1076.8755731281. The cubic root of 1159661 is about 105.0615210142.

The spelling of 1159661 in words is "one million, one hundred fifty-nine thousand, six hundred sixty-one".