1428571091 has 4 divisors (see below), whose sum is σ = 1448140632. Its totient is φ = 1409001552.

The previous prime is 1428571087. The next prime is 1428571093. The reversal of 1428571091 is 1901758241.

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

It is a cyclic number.

It is not a de Polignac number, because 1428571091 - 2² = 1428571087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1428571093) 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, 9784661 + ... + 9784806.

It is an arithmetic number, because the mean of its divisors is an integer number (362035158).

Almost surely, 2^1428571091 is an apocalyptic number.

1428571091 is a deficient number, since it is larger than the sum of its proper divisors (19569541).

1428571091 is an equidigital number, since it uses as much as digits as its factorization.

1428571091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19569540.

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 1428571091 is about 37796.4428352722. The cubic root of 1428571091 is about 1126.2477917328.

The spelling of 1428571091 in words is "one billion, four hundred twenty-eight million, five hundred seventy-one thousand, ninety-one".