1056661 has 4 divisors (see below), whose sum is σ = 1076652. Its totient is φ = 1036672.

The previous prime is 1056659. The next prime is 1056667. The reversal of 1056661 is 1666501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1666501 = 109 ⋅15289.

It can be written as a sum of positive squares in 2 ways, for example, as 463761 + 592900 = 681^2 + 770^2 .

It is a cyclic number.

It is not a de Polignac number, because 1056661 - 2¹ = 1056659 is a prime.

It is a super-2 number, since 2×1056661² = 2233064937842, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1056667) 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, 9916 + ... + 10021.

It is an arithmetic number, because the mean of its divisors is an integer number (269163).

2^1056661 is an apocalyptic number.

It is an amenable number.

1056661 is a deficient number, since it is larger than the sum of its proper divisors (19991).

1056661 is an equidigital number, since it uses as much as digits as its factorization.

1056661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19990.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1056661 is about 1027.9401733564. The cubic root of 1056661 is about 101.8541102864.

The spelling of 1056661 in words is "one million, fifty-six thousand, six hundred sixty-one".