1161265143 has 8 divisors (see below), whose sum is σ = 1581297408. Its totient is φ = 757704824.

The previous prime is 1161265129. The next prime is 1161265153. The reversal of 1161265143 is 3415621611.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1161265143 - 2¹⁰ = 1161264119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1161265143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161265103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4117821 + ... + 4118102.

It is an arithmetic number, because the mean of its divisors is an integer number (197662176).

Almost surely, 2^1161265143 is an apocalyptic number.

1161265143 is a deficient number, since it is larger than the sum of its proper divisors (420032265).

1161265143 is an equidigital number, since it uses as much as digits as its factorization.

1161265143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8235973.

The product of its digits is 4320, while the sum is 30.

The square root of 1161265143 is about 34077.3406092670. The cubic root of 1161265143 is about 1051.0994207662.

Adding to 1161265143 its reverse (3415621611), we get a palindrome (4576886754).

The spelling of 1161265143 in words is "one billion, one hundred sixty-one million, two hundred sixty-five thousand, one hundred forty-three".