2057661 has 12 divisors (see below), whose sum is σ = 3004092. Its totient is φ = 1357056.

The previous prime is 2057659. The next prime is 2057669. The reversal of 2057661 is 1667502.

It can be written as a sum of positive squares in 2 ways, for example, as 632025 + 1425636 = 795^2 + 1194^2 .

It is not a de Polignac number, because 2057661 - 2¹ = 2057659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2057669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 306 + ... + 2051.

It is an arithmetic number, because the mean of its divisors is an integer number (250341).

2^2057661 is an apocalyptic number.

It is an amenable number.

2057661 is a deficient number, since it is larger than the sum of its proper divisors (946431).

2057661 is a wasteful number, since it uses less digits than its factorization.

2057661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2460 (or 2457 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 2057661 is about 1434.4549487523. The cubic root of 2057661 is about 127.1914569437.

The spelling of 2057661 in words is "two million, fifty-seven thousand, six hundred sixty-one".