1111611111731 has 2 divisors, whose sum is σ = 1111611111732. Its totient is φ = 1111611111730.

The previous prime is 1111611111713. The next prime is 1111611111857. The reversal of 1111611111731 is 1371111161111.

Together with previous prime (1111611111713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a m-pointer prime, because the next prime (1111611111857) can be obtained adding 1111611111731 to its product of digits (126).

It is a weak prime.

It is an emirp because it is prime and its reverse (1371111161111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1111611111731 is a prime.

It is a super-2 number, since 2×1111611111731² (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 1111611111731.

It is not a weakly prime, because it can be changed into another prime (1111611131731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555805555865 + 555805555866.

It is an arithmetic number, because the mean of its divisors is an integer number (555805555866).

Almost surely, 2^{1111611111731} is an apocalyptic number.

1111611111731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111611111731 is an equidigital number, since it uses as much as digits as its factorization.

1111611111731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 126, while the sum is 26.

Adding to 1111611111731 its reverse (1371111161111), we get a palindrome (2482722272842).

The spelling of 1111611111731 in words is "one trillion, one hundred eleven billion, six hundred eleven million, one hundred eleven thousand, seven hundred thirty-one".