1156661 has 8 divisors (see below), whose sum is σ = 1280448. Its totient is φ = 1036000.

The previous prime is 1156643. The next prime is 1156681. The reversal of 1156661 is 1666511.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1156661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1156661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41 + ... + 1521.

It is an arithmetic number, because the mean of its divisors is an integer number (160056).

2^1156661 is an apocalyptic number.

1156661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1156661 is a deficient number, since it is larger than the sum of its proper divisors (123787).

1156661 is a wasteful number, since it uses less digits than its factorization.

1156661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563.

The product of its digits is 1080, while the sum is 26.

The square root of 1156661 is about 1075.4817525184. The cubic root of 1156661 is about 104.9708460254.

It can be divided in two parts, 115 and 6661, that added together give a palindrome (6776).

The spelling of 1156661 in words is "one million, one hundred fifty-six thousand, six hundred sixty-one".