1131310181 has 2 divisors, whose sum is σ = 1131310182. Its totient is φ = 1131310180.

The previous prime is 1131310133. The next prime is 1131310183. The reversal of 1131310181 is 1810131311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 754600900 + 376709281 = 27470^2 + 19409^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131310181 - 2¹⁴ = 1131293797 is a prime.

It is a super-2 number, since 2×1131310181² = 2559725451268505522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1131310183, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131310183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565655090 + 565655091.

It is an arithmetic number, because the mean of its divisors is an integer number (565655091).

Almost surely, 2^1131310181 is an apocalyptic number.

It is an amenable number.

1131310181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131310181 is an equidigital number, since it uses as much as digits as its factorization.

1131310181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 1131310181 is about 33634.9547494864. The cubic root of 1131310181 is about 1041.9828360734.

Adding to 1131310181 its reverse (1810131311), we get a palindrome (2941441492).

The spelling of 1131310181 in words is "one billion, one hundred thirty-one million, three hundred ten thousand, one hundred eighty-one".