1056391 has 6 divisors (see below), whose sum is σ = 1228920. Its totient is φ = 905436.

The previous prime is 1056379. The next prime is 1056401. The reversal of 1056391 is 1936501.

It is a de Polignac number, because none of the positive numbers 2^k-1056391 is a prime.

It is a super-2 number, since 2×1056391² = 2231923889762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1056311) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10731 + ... + 10828.

It is an arithmetic number, because the mean of its divisors is an integer number (204820).

2^1056391 is an apocalyptic number.

1056391 is a deficient number, since it is larger than the sum of its proper divisors (172529).

1056391 is an equidigital number, since it uses as much as digits as its factorization.

1056391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21573 (or 21566 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 1056391 is about 1027.8088343656. The cubic root of 1056391 is about 101.8454342297.

The spelling of 1056391 in words is "one million, fifty-six thousand, three hundred ninety-one".