1131220313081 has 2 divisors, whose sum is σ = 1131220313082. Its totient is φ = 1131220313080.

The previous prime is 1131220313057. The next prime is 1131220313089. The reversal of 1131220313081 is 1803130221311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 798878440000 + 332341873081 = 893800^2 + 576491^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131220313081 - 2²⁶ = 1131153204217 is a prime.

It is a super-2 number, since 2×1131220313081² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1131220313081.

It is not a weakly prime, because it can be changed into another prime (1131220313089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565610156540 + 565610156541.

It is an arithmetic number, because the mean of its divisors is an integer number (565610156541).

Almost surely, 2^{1131220313081} is an apocalyptic number.

It is an amenable number.

1131220313081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131220313081 is an equidigital number, since it uses as much as digits as its factorization.

1131220313081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

Adding to 1131220313081 its reverse (1803130221311), we get a palindrome (2934350534392).

The spelling of 1131220313081 in words is "one trillion, one hundred thirty-one billion, two hundred twenty million, three hundred thirteen thousand, eighty-one".