1055661 has 4 divisors (see below), whose sum is σ = 1407552. Its totient is φ = 703772.

The previous prime is 1055611. The next prime is 1055671. The reversal of 1055661 is 1665501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1665501 = 3 ⋅555167.

It is a cyclic number.

It is not a de Polignac number, because 1055661 - 2⁶ = 1055597 is a prime.

It is a super-2 number, since 2×1055661² = 2228840293842, which contains 22 as substring.

It is a D-number.

1055661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1055611) 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, 175941 + ... + 175946.

It is an arithmetic number, because the mean of its divisors is an integer number (351888).

2^1055661 is an apocalyptic number.

It is an amenable number.

1055661 is a deficient number, since it is larger than the sum of its proper divisors (351891).

1055661 is an equidigital number, since it uses as much as digits as its factorization.

1055661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351890.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 1055661 is about 1027.4536485896. The cubic root of 1055661 is about 101.8219693387.

The spelling of 1055661 in words is "one million, fifty-five thousand, six hundred sixty-one".