111809413 has 4 divisors (see below), whose sum is σ = 115664940. Its totient is φ = 107953888.

The previous prime is 111809393. The next prime is 111809429. The reversal of 111809413 is 314908111.

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

It can be written as a sum of positive squares in 2 ways, for example, as 79977249 + 31832164 = 8943^2 + 5642^2 .

It is a cyclic number.

It is not a de Polignac number, because 111809413 - 2¹⁷ = 111678341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111809713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1927720 + ... + 1927777.

It is an arithmetic number, because the mean of its divisors is an integer number (28916235).

Almost surely, 2^111809413 is an apocalyptic number.

It is an amenable number.

111809413 is a deficient number, since it is larger than the sum of its proper divisors (3855527).

111809413 is an equidigital number, since it uses as much as digits as its factorization.

111809413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3855526.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 111809413 is about 10573.9970209945. The cubic root of 111809413 is about 481.7548798710.

The spelling of 111809413 in words is "one hundred eleven million, eight hundred nine thousand, four hundred thirteen".