111142439 has 2 divisors, whose sum is σ = 111142440. Its totient is φ = 111142438.

The previous prime is 111142433. The next prime is 111142453. The reversal of 111142439 is 934241111.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111142439 - 2²⁴ = 94365223 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111142433) 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, 55571219 + 55571220.

It is an arithmetic number, because the mean of its divisors is an integer number (55571220).

Almost surely, 2^111142439 is an apocalyptic number.

111142439 is a deficient number, since it is larger than the sum of its proper divisors (1).

111142439 is an equidigital number, since it uses as much as digits as its factorization.

111142439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 26.

The square root of 111142439 is about 10542.4114414113. The cubic root of 111142439 is about 480.7950351577.

The spelling of 111142439 in words is "one hundred eleven million, one hundred forty-two thousand, four hundred thirty-nine".