111231613 has 2 divisors, whose sum is σ = 111231614. Its totient is φ = 111231612.

The previous prime is 111231607. The next prime is 111231649. The reversal of 111231613 is 316132111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60793209 + 50438404 = 7797^2 + 7102^2 .

It is a cyclic number.

It is not a de Polignac number, because 111231613 - 2¹⁷ = 111100541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111231313) 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, 55615806 + 55615807.

It is an arithmetic number, because the mean of its divisors is an integer number (55615807).

Almost surely, 2^111231613 is an apocalyptic number.

It is an amenable number.

111231613 is a deficient number, since it is larger than the sum of its proper divisors (1).

111231613 is an equidigital number, since it uses as much as digits as its factorization.

111231613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108, while the sum is 19.

The square root of 111231613 is about 10546.6398914536. The cubic root of 111231613 is about 480.9235877770.

Adding to 111231613 its reverse (316132111), we get a palindrome (427363724).

The spelling of 111231613 in words is "one hundred eleven million, two hundred thirty-one thousand, six hundred thirteen".