111542399 has 4 divisors (see below), whose sum is σ = 111611136. Its totient is φ = 111473664.

The previous prime is 111542393. The next prime is 111542429. The reversal of 111542399 is 993245111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111542399 - 2¹⁶ = 111476863 is a prime.

It is a super-3 number, since 3×111542399³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111542393) 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 in 3 ways as a sum of consecutive naturals, for example, 31874 + ... + 35199.

It is an arithmetic number, because the mean of its divisors is an integer number (27902784).

Almost surely, 2^111542399 is an apocalyptic number.

111542399 is a deficient number, since it is larger than the sum of its proper divisors (68737).

111542399 is an equidigital number, since it uses as much as digits as its factorization.

111542399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68736.

The product of its digits is 9720, while the sum is 35.

The square root of 111542399 is about 10561.3635009879. The cubic root of 111542399 is about 481.3710784574.

The spelling of 111542399 in words is "one hundred eleven million, five hundred forty-two thousand, three hundred ninety-nine".