111428687 has 2 divisors, whose sum is σ = 111428688. Its totient is φ = 111428686.

The previous prime is 111428683. The next prime is 111428699. The reversal of 111428687 is 786824111.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111428687 - 2² = 111428683 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111428687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111428683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55714343 + 55714344.

It is an arithmetic number, because the mean of its divisors is an integer number (55714344).

Almost surely, 2^111428687 is an apocalyptic number.

111428687 is a deficient number, since it is larger than the sum of its proper divisors (1).

111428687 is an equidigital number, since it uses as much as digits as its factorization.

111428687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 38.

The square root of 111428687 is about 10555.9787324530. The cubic root of 111428687 is about 481.2074447782.

The spelling of 111428687 in words is "one hundred eleven million, four hundred twenty-eight thousand, six hundred eighty-seven".