1185661 has 2 divisors, whose sum is σ = 1185662. Its totient is φ = 1185660.

The previous prime is 1185659. The next prime is 1185671. The reversal of 1185661 is 1665811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1092025 + 93636 = 1045^2 + 306^2 .

It is a cyclic number.

It is not a de Polignac number, because 1185661 - 2¹ = 1185659 is a prime.

Together with 1185659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1185601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 592830 + 592831.

It is an arithmetic number, because the mean of its divisors is an integer number (592831).

2^1185661 is an apocalyptic number.

It is an amenable number.

1185661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1185661 is an equidigital number, since it uses as much as digits as its factorization.

1185661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 28.

The square root of 1185661 is about 1088.8806178824. The cubic root of 1185661 is about 105.8408969457.

The spelling of 1185661 in words is "one million, one hundred eighty-five thousand, six hundred sixty-one".