111331531 has 2 divisors, whose sum is σ = 111331532. Its totient is φ = 111331530.

The previous prime is 111331513. The next prime is 111331547. The reversal of 111331531 is 135133111.

Together with previous prime (111331513) 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 111331531 - 2¹³ = 111323339 is a prime.

It is a super-2 number, since 2×111331531² = 24789419589607922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111331499 and 111331508.

It is not a weakly prime, because it can be changed into another prime (111331501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55665765 + 55665766.

It is an arithmetic number, because the mean of its divisors is an integer number (55665766).

Almost surely, 2^111331531 is an apocalyptic number.

111331531 is a deficient number, since it is larger than the sum of its proper divisors (1).

111331531 is an equidigital number, since it uses as much as digits as its factorization.

111331531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 135, while the sum is 19.

The square root of 111331531 is about 10551.3757870716. The cubic root of 111331531 is about 481.0675472758.

Adding to 111331531 its reverse (135133111), we get a palindrome (246464642).

The spelling of 111331531 in words is "one hundred eleven million, three hundred thirty-one thousand, five hundred thirty-one".