1145661 has 16 divisors (see below), whose sum is σ = 1684800. Its totient is φ = 686720.

The previous prime is 1145659. The next prime is 1145689. The reversal of 1145661 is 1665411.

It is a cyclic number.

It is not a de Polignac number, because 1145661 - 2¹ = 1145659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145611) 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 15 ways as a sum of consecutive naturals, for example, 4801 + ... + 5033.

It is an arithmetic number, because the mean of its divisors is an integer number (105300).

2^1145661 is an apocalyptic number.

1145661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1145661 is a deficient number, since it is larger than the sum of its proper divisors (539139).

1145661 is a wasteful number, since it uses less digits than its factorization.

1145661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396.

The product of its digits is 720, while the sum is 24.

The square root of 1145661 is about 1070.3555484044. The cubic root of 1145661 is about 104.6370233082.

It can be divided in two parts, 114 and 5661, that added together give a palindrome (5775).

The spelling of 1145661 in words is "one million, one hundred forty-five thousand, six hundred sixty-one".