1140561 has 10 divisors (see below), whose sum is σ = 1703922. Its totient is φ = 760320.

The previous prime is 1140539. The next prime is 1140563. The reversal of 1140561 is 1650411.

It can be written as a sum of positive squares in only one way, i.e., 1089936 + 50625 = 1044^2 + 225^2 .

It is not a de Polignac number, because 1140561 - 2¹⁵ = 1107793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1140563) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 6960 + ... + 7121.

2^1140561 is an apocalyptic number.

It is an amenable number.

1140561 is a deficient number, since it is larger than the sum of its proper divisors (563361).

1140561 is an equidigital number, since it uses as much as digits as its factorization.

1140561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14093 (or 14084 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1140561 is about 1067.9705052107. The cubic root of 1140561 is about 104.4815256979.

Adding to 1140561 its reverse (1650411), we get a palindrome (2790972).

The spelling of 1140561 in words is "one million, one hundred forty thousand, five hundred sixty-one".