1140312561 has 16 divisors (see below), whose sum is σ = 1587876480. Its totient is φ = 726535040.

The previous prime is 1140312533. The next prime is 1140312577. The reversal of 1140312561 is 1652130411.

It is a happy number.

It is not a de Polignac number, because 1140312561 - 2⁶ = 1140312497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1140312521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82531 + ... + 95351.

It is an arithmetic number, because the mean of its divisors is an integer number (99242280).

Almost surely, 2^1140312561 is an apocalyptic number.

It is an amenable number.

1140312561 is a deficient number, since it is larger than the sum of its proper divisors (447563919).

1140312561 is a wasteful number, since it uses less digits than its factorization.

1140312561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14136.

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

The square root of 1140312561 is about 33768.5143439862. The cubic root of 1140312561 is about 1044.7393903060.

Adding to 1140312561 its reverse (1652130411), we get a palindrome (2792442972).

The spelling of 1140312561 in words is "one billion, one hundred forty million, three hundred twelve thousand, five hundred sixty-one".