111428069 has 4 divisors (see below), whose sum is σ = 111452544. Its totient is φ = 111403596.

The previous prime is 111428059. The next prime is 111428087. The reversal of 111428069 is 960824111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111428069 - 2¹⁶ = 111362533 is a prime.

It is a super-2 number, since 2×111428069² = 24832429122137522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111428059) 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, 3167 + ... + 15260.

It is an arithmetic number, because the mean of its divisors is an integer number (27863136).

Almost surely, 2^111428069 is an apocalyptic number.

It is an amenable number.

111428069 is a deficient number, since it is larger than the sum of its proper divisors (24475).

111428069 is an equidigital number, since it uses as much as digits as its factorization.

111428069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24474.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 111428069 is about 10555.9494599017. The cubic root of 111428069 is about 481.2065551606.

The spelling of 111428069 in words is "one hundred eleven million, four hundred twenty-eight thousand, sixty-nine".