1115661 has 24 divisors (see below), whose sum is σ = 1681120. Its totient is φ = 655776.

The previous prime is 1115657. The next prime is 1115683. The reversal of 1115661 is 1665111.

It is not a de Polignac number, because 1115661 - 2² = 1115657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1115641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30135 + ... + 30171.

2^1115661 is an apocalyptic number.

It is an amenable number.

1115661 is a deficient number, since it is larger than the sum of its proper divisors (565459).

1115661 is a wasteful number, since it uses less digits than its factorization.

1115661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105 (or 82 counting only the distinct ones).

The product of its digits is 180, while the sum is 21.

The square root of 1115661 is about 1056.2485502949. The cubic root of 1115661 is about 103.7155999565.

It can be divided in two parts, 11 and 15661, that multiplied together give a palindrome (172271).

The spelling of 1115661 in words is "one million, one hundred fifteen thousand, six hundred sixty-one".