1057891 has 4 divisors (see below), whose sum is σ = 1094400. Its totient is φ = 1021384.

The previous prime is 1057883. The next prime is 1057897. The reversal of 1057891 is 1987501.

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 1057891 - 2³ = 1057883 is a prime.

It is a super-2 number, since 2×1057891² = 2238266735762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1057897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18211 + ... + 18268.

It is an arithmetic number, because the mean of its divisors is an integer number (273600).

2^1057891 is an apocalyptic number.

1057891 is a deficient number, since it is larger than the sum of its proper divisors (36509).

1057891 is an equidigital number, since it uses as much as digits as its factorization.

1057891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36508.

The product of its (nonzero) digits is 2520, while the sum is 31.

The square root of 1057891 is about 1028.5382831961. The cubic root of 1057891 is about 101.8936158536.

The spelling of 1057891 in words is "one million, fifty-seven thousand, eight hundred ninety-one".