111115531 has 2 divisors, whose sum is σ = 111115532. Its totient is φ = 111115530.

The previous prime is 111115523. The next prime is 111115573. The reversal of 111115531 is 135511111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111115531 - 2³ = 111115523 is a prime.

It is a super-2 number, since 2×111115531² = 24693322458823922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111115499 and 111115508.

It is not a weakly prime, because it can be changed into another prime (111115031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55557765 + 55557766.

It is an arithmetic number, because the mean of its divisors is an integer number (55557766).

Almost surely, 2^111115531 is an apocalyptic number.

111115531 is a deficient number, since it is larger than the sum of its proper divisors (1).

111115531 is an equidigital number, since it uses as much as digits as its factorization.

111115531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75, while the sum is 19.

The square root of 111115531 is about 10541.1351855481. The cubic root of 111115531 is about 480.7562312675.

Adding to 111115531 its reverse (135511111), we get a palindrome (246626642).

The spelling of 111115531 in words is "one hundred eleven million, one hundred fifteen thousand, five hundred thirty-one".