1161323251 has 8 divisors (see below), whose sum is σ = 1267144704. Its totient is φ = 1055542920.

The previous prime is 1161323243. The next prime is 1161323257. The reversal of 1161323251 is 1523231611.

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 1161323251 - 2³ = 1161323243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1161323257) 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, 107566 + ... + 117868.

It is an arithmetic number, because the mean of its divisors is an integer number (158393088).

Almost surely, 2^1161323251 is an apocalyptic number.

1161323251 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1161323251 is a deficient number, since it is larger than the sum of its proper divisors (105821453).

1161323251 is a wasteful number, since it uses less digits than its factorization.

1161323251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20561.

The product of its digits is 1080, while the sum is 25.

The square root of 1161323251 is about 34078.1931886067. The cubic root of 1161323251 is about 1051.1169522969.

Adding to 1161323251 its reverse (1523231611), we get a palindrome (2684554862).

The spelling of 1161323251 in words is "one billion, one hundred sixty-one million, three hundred twenty-three thousand, two hundred fifty-one".