1161241231 has 2 divisors, whose sum is σ = 1161241232. Its totient is φ = 1161241230.

The previous prime is 1161241163. The next prime is 1161241241. The reversal of 1161241231 is 1321421611.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1161241231 - 2¹⁵ = 1161208463 is a prime.

It is a super-2 number, since 2×1161241231² = 2696962393148790722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1161241241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580620615 + 580620616.

It is an arithmetic number, because the mean of its divisors is an integer number (580620616).

Almost surely, 2^1161241231 is an apocalyptic number.

1161241231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161241231 is an equidigital number, since it uses as much as digits as its factorization.

1161241231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 22.

The square root of 1161241231 is about 34076.9897584866. The cubic root of 1161241231 is about 1051.0922062031.

Adding to 1161241231 its reverse (1321421611), we get a palindrome (2482662842).

The spelling of 1161241231 in words is "one billion, one hundred sixty-one million, two hundred forty-one thousand, two hundred thirty-one".