111115555631 has 2 divisors, whose sum is σ = 111115555632. Its totient is φ = 111115555630.

The previous prime is 111115555571. The next prime is 111115555633. The reversal of 111115555631 is 136555511111.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111115555631 is a prime.

It is a super-2 number, since 2×111115555631² (a number of 23 digits) contains 22 as substring.

Together with 111115555633, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 111115555591 and 111115555600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111115555633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55557777815 + 55557777816.

It is an arithmetic number, because the mean of its divisors is an integer number (55557777816).

Almost surely, 2^111115555631 is an apocalyptic number.

111115555631 is a deficient number, since it is larger than the sum of its proper divisors (1).

111115555631 is an equidigital number, since it uses as much as digits as its factorization.

111115555631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11250, while the sum is 35.

The spelling of 111115555631 in words is "one hundred eleven billion, one hundred fifteen million, five hundred fifty-five thousand, six hundred thirty-one".