1131340511261 has 2 divisors, whose sum is σ = 1131340511262. Its totient is φ = 1131340511260.

The previous prime is 1131340511239. The next prime is 1131340511267. The reversal of 1131340511261 is 1621150431311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1031291025625 + 100049485636 = 1015525^2 + 316306^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131340511261 is a prime.

It is a Sophie Germain 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 (1131340511267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565670255630 + 565670255631.

It is an arithmetic number, because the mean of its divisors is an integer number (565670255631).

Almost surely, 2^{1131340511261} is an apocalyptic number.

It is an amenable number.

1131340511261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131340511261 is an equidigital number, since it uses as much as digits as its factorization.

1131340511261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

Adding to 1131340511261 its reverse (1621150431311), we get a palindrome (2752490942572).

The spelling of 1131340511261 in words is "one trillion, one hundred thirty-one billion, three hundred forty million, five hundred eleven thousand, two hundred sixty-one".