1163405261 has 8 divisors (see below), whose sum is σ = 1172544000. Its totient is φ = 1154284560.

The previous prime is 1163405213. The next prime is 1163405303. The reversal of 1163405261 is 1625043611.

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 1163405261 - 2¹⁰ = 1163404237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1163407261) 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, 143720 + ... + 151598.

It is an arithmetic number, because the mean of its divisors is an integer number (146568000).

Almost surely, 2^1163405261 is an apocalyptic number.

It is an amenable number.

1163405261 is a deficient number, since it is larger than the sum of its proper divisors (9138739).

1163405261 is an equidigital number, since it uses as much as digits as its factorization.

1163405261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9019.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1163405261 is about 34108.7270504192. The cubic root of 1163405261 is about 1051.7447216689.

Adding to 1163405261 its reverse (1625043611), we get a palindrome (2788448872).

The spelling of 1163405261 in words is "one billion, one hundred sixty-three million, four hundred five thousand, two hundred sixty-one".