1161661 has 8 divisors (see below), whose sum is σ = 1283904. Its totient is φ = 1045440.

The previous prime is 1161659. The next prime is 1161683. The reversal of 1161661 is 1661611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1161661 - 2¹ = 1161659 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1095 + ... + 1876.

It is an arithmetic number, because the mean of its divisors is an integer number (160488).

2^1161661 is an apocalyptic number.

It is an amenable number.

1161661 is a deficient number, since it is larger than the sum of its proper divisors (122243).

1161661 is a wasteful number, since it uses less digits than its factorization.

1161661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3011.

The product of its digits is 216, while the sum is 22.

The square root of 1161661 is about 1077.8037854823. The cubic root of 1161661 is about 105.1218841611.

The spelling of 1161661 in words is "one million, one hundred sixty-one thousand, six hundred sixty-one".