2055661 has 4 divisors (see below), whose sum is σ = 2080512. Its totient is φ = 2030812.

The previous prime is 2055649. The next prime is 2055673. The reversal of 2055661 is 1665502.

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.

It is an interprime number because it is at equal distance from previous prime (2055649) and next prime (2055673).

It is a cyclic number.

It is not a de Polignac number, because 2055661 - 2¹⁵ = 2022893 is a prime.

It is a Duffinian number.

2055661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2055611) 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, 12301 + ... + 12466.

It is an arithmetic number, because the mean of its divisors is an integer number (520128).

2^2055661 is an apocalyptic number.

It is an amenable number.

2055661 is a deficient number, since it is larger than the sum of its proper divisors (24851).

2055661 is an equidigital number, since it uses as much as digits as its factorization.

2055661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24850.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 2055661 is about 1433.7576503719. The cubic root of 2055661 is about 127.1502345110.

The spelling of 2055661 in words is "two million, fifty-five thousand, six hundred sixty-one".