1056991 has 4 divisors (see below), whose sum is σ = 1138312. Its totient is φ = 975672.

The previous prime is 1056971. The next prime is 1057003. The reversal of 1056991 is 1996501.

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 1056991 - 2⁵ = 1056959 is a prime.

It is a super-2 number, since 2×1056991² = 2234459948162, 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 (1056911) 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, 40641 + ... + 40666.

It is an arithmetic number, because the mean of its divisors is an integer number (284578).

2^1056991 is an apocalyptic number.

1056991 is a deficient number, since it is larger than the sum of its proper divisors (81321).

1056991 is an equidigital number, since it uses as much as digits as its factorization.

1056991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81320.

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 1056991 is about 1028.1006760041. The cubic root of 1056991 is about 101.8647123489.

The spelling of 1056991 in words is "one million, fifty-six thousand, nine hundred ninety-one".