111428497 has 4 divisors (see below), whose sum is σ = 114440116. Its totient is φ = 108416880.

The previous prime is 111428431. The next prime is 111428503. The reversal of 111428497 is 794824111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 794824111 = 97 ⋅8194063.

It can be written as a sum of positive squares in 2 ways, for example, as 95179536 + 16248961 = 9756^2 + 4031^2 .

It is a cyclic number.

It is not a de Polignac number, because 111428497 - 2²³ = 103039889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 3011581 = 111428497 / (1 + 1 + 1 + 4 + 2 + 8 + 4 + 9 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111428797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1505754 + ... + 1505827.

It is an arithmetic number, because the mean of its divisors is an integer number (28610029).

Almost surely, 2^111428497 is an apocalyptic number.

It is an amenable number.

111428497 is a deficient number, since it is larger than the sum of its proper divisors (3011619).

111428497 is an equidigital number, since it uses as much as digits as its factorization.

111428497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3011618.

The product of its digits is 16128, while the sum is 37.

The square root of 111428497 is about 10555.9697328100. The cubic root of 111428497 is about 481.2071712715.

The spelling of 111428497 in words is "one hundred eleven million, four hundred twenty-eight thousand, four hundred ninety-seven".