111690427 has 4 divisors (see below), whose sum is σ = 115293376. Its totient is φ = 108087480.

The previous prime is 111690421. The next prime is 111690463. The reversal of 111690427 is 724096111.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111690427 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 3602917 = 111690427 / (1 + 1 + 1 + 6 + 9 + 0 + 4 + 2 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111690421) 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, 1801428 + ... + 1801489.

It is an arithmetic number, because the mean of its divisors is an integer number (28823344).

Almost surely, 2^111690427 is an apocalyptic number.

111690427 is a deficient number, since it is larger than the sum of its proper divisors (3602949).

111690427 is an equidigital number, since it uses as much as digits as its factorization.

111690427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3602948.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 111690427 is about 10568.3691740968. The cubic root of 111690427 is about 481.5839269658.

The spelling of 111690427 in words is "one hundred eleven million, six hundred ninety thousand, four hundred twenty-seven".