1140243553 has 4 divisors (see below), whose sum is σ = 1144786608. Its totient is φ = 1135700500.

The previous prime is 1140243551. The next prime is 1140243571. The reversal of 1140243553 is 3553420411.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3553420411 = 13553 ⋅262187.

It is a cyclic number.

It is not a de Polignac number, because 1140243553 - 2¹ = 1140243551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1140243551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2271151 + ... + 2271652.

It is an arithmetic number, because the mean of its divisors is an integer number (286196652).

Almost surely, 2^1140243553 is an apocalyptic number.

It is an amenable number.

1140243553 is a deficient number, since it is larger than the sum of its proper divisors (4543055).

1140243553 is an equidigital number, since it uses as much as digits as its factorization.

1140243553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4543054.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 1140243553 is about 33767.4925483075. The cubic root of 1140243553 is about 1044.7183151398.

Adding to 1140243553 its reverse (3553420411), we get a palindrome (4693663964).

The spelling of 1140243553 in words is "one billion, one hundred forty million, two hundred forty-three thousand, five hundred fifty-three".