111539993 has 2 divisors, whose sum is σ = 111539994. Its totient is φ = 111539992.

The previous prime is 111539963. The next prime is 111539999. The reversal of 111539993 is 399935111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96275344 + 15264649 = 9812^2 + 3907^2 .

It is a cyclic number.

It is not a de Polignac number, because 111539993 - 2¹⁴ = 111523609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111539993.

It is not a weakly prime, because it can be changed into another prime (111539999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55769996 + 55769997.

It is an arithmetic number, because the mean of its divisors is an integer number (55769997).

Almost surely, 2^111539993 is an apocalyptic number.

It is an amenable number.

111539993 is a deficient number, since it is larger than the sum of its proper divisors (1).

111539993 is an equidigital number, since it uses as much as digits as its factorization.

111539993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32805, while the sum is 41.

The square root of 111539993 is about 10561.2495946266. The cubic root of 111539993 is about 481.3676173306.

The spelling of 111539993 in words is "one hundred eleven million, five hundred thirty-nine thousand, nine hundred ninety-three".