1428069091 has 4 divisors (see below), whose sum is σ = 1428158952. Its totient is φ = 1427979232.

The previous prime is 1428069067. The next prime is 1428069101. The reversal of 1428069091 is 1909608241.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1428069091 - 2⁷ = 1428068963 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1428069791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13990 + ... + 55243.

It is an arithmetic number, because the mean of its divisors is an integer number (357039738).

Almost surely, 2^1428069091 is an apocalyptic number.

1428069091 is a deficient number, since it is larger than the sum of its proper divisors (89861).

1428069091 is an equidigital number, since it uses as much as digits as its factorization.

1428069091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89860.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 1428069091 is about 37789.8014151967. The cubic root of 1428069091 is about 1126.1158550882.

The spelling of 1428069091 in words is "one billion, four hundred twenty-eight million, sixty-nine thousand, ninety-one".