111540399 has 4 divisors (see below), whose sum is σ = 148720536. Its totient is φ = 74360264.

The previous prime is 111540347. The next prime is 111540413. The reversal of 111540399 is 993045111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993045111 = 3 ⋅331015037.

It is a cyclic number.

It is not a de Polignac number, because 111540399 - 2¹¹ = 111538351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111540329) 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 in 3 ways as a sum of consecutive naturals, for example, 18590064 + ... + 18590069.

It is an arithmetic number, because the mean of its divisors is an integer number (37180134).

Almost surely, 2^111540399 is an apocalyptic number.

111540399 is a deficient number, since it is larger than the sum of its proper divisors (37180137).

111540399 is an equidigital number, since it uses as much as digits as its factorization.

111540399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37180136.

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 111540399 is about 10561.2688158194. The cubic root of 111540399 is about 481.3682013813.

It can be divided in two parts, 1115 and 40399, that added together give a palindrome (41514).

The spelling of 111540399 in words is "one hundred eleven million, five hundred forty thousand, three hundred ninety-nine".