11131121731 has 2 divisors, whose sum is σ = 11131121732. Its totient is φ = 11131121730.

The previous prime is 11131121713. The next prime is 11131121741. The reversal of 11131121731 is 13712113111.

Together with previous prime (11131121713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11131121731 - 2²⁹ = 10594250819 is a prime.

It is a super-2 number, since 2×11131121731² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11131121741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5565560865 + 5565560866.

It is an arithmetic number, because the mean of its divisors is an integer number (5565560866).

Almost surely, 2^11131121731 is an apocalyptic number.

11131121731 is a deficient number, since it is larger than the sum of its proper divisors (1).

11131121731 is an equidigital number, since it uses as much as digits as its factorization.

11131121731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 126, while the sum is 22.

Adding to 11131121731 its reverse (13712113111), we get a palindrome (24843234842).

The spelling of 11131121731 in words is "eleven billion, one hundred thirty-one million, one hundred twenty-one thousand, seven hundred thirty-one".