1161323153 has 4 divisors (see below), whose sum is σ = 1211815488. Its totient is φ = 1110830820.

The previous prime is 1161323129. The next prime is 1161323161. The reversal of 1161323153 is 3513231611.

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.

It is a cyclic number.

It is not a de Polignac number, because 1161323153 - 2¹² = 1161319057 is a prime.

It is a super-2 number, since 2×1161323153² = 2697342931387722818, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1161343153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25246133 + ... + 25246178.

It is an arithmetic number, because the mean of its divisors is an integer number (302953872).

Almost surely, 2^1161323153 is an apocalyptic number.

It is an amenable number.

1161323153 is a deficient number, since it is larger than the sum of its proper divisors (50492335).

1161323153 is an equidigital number, since it uses as much as digits as its factorization.

1161323153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50492334.

The product of its digits is 1620, while the sum is 26.

The square root of 1161323153 is about 34078.1917507370. The cubic root of 1161323153 is about 1051.1169227302.

Adding to 1161323153 its reverse (3513231611), we get a palindrome (4674554764).

The spelling of 1161323153 in words is "one billion, one hundred sixty-one million, three hundred twenty-three thousand, one hundred fifty-three".