1161323253 has 12 divisors (see below), whose sum is σ = 1690273728. Its totient is φ = 768304680.

The previous prime is 1161323243. The next prime is 1161323257. The reversal of 1161323253 is 3523231611.

1161323253 is a `hidden beast` number, since 1 + 1 + 613 + 23 + 25 + 3 = 666.

It is not a de Polignac number, because 1161323253 - 2²² = 1157128949 is a prime.

It is a congruent 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 11 ways as a sum of consecutive naturals, for example, 491325 + ... + 493682.

It is an arithmetic number, because the mean of its divisors is an integer number (140856144).

Almost surely, 2^1161323253 is an apocalyptic number.

It is an amenable number.

1161323253 is a deficient number, since it is larger than the sum of its proper divisors (528950475).

1161323253 is a wasteful number, since it uses less digits than its factorization.

1161323253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985144 (or 985141 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 1161323253 is about 34078.1932179510. The cubic root of 1161323253 is about 1051.1169529003.

Adding to 1161323253 its reverse (3523231611), we get a palindrome (4684554864).

The spelling of 1161323253 in words is "one billion, one hundred sixty-one million, three hundred twenty-three thousand, two hundred fifty-three".