2561057 has 4 divisors (see below), whose sum is σ = 2586516. Its totient is φ = 2535600.

The previous prime is 2561051. The next prime is 2561063. The reversal of 2561057 is 7501652.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2561051) and next prime (2561063).

It can be written as a sum of positive squares in 2 ways, for example, as 1784896 + 776161 = 1336^2 + 881^2 .

It is a cyclic number.

It is not a de Polignac number, because 2561057 - 2⁶ = 2560993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2561051) 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, 12578 + ... + 12779.

It is an arithmetic number, because the mean of its divisors is an integer number (646629).

2^2561057 is an apocalyptic number.

It is an amenable number.

2561057 is a deficient number, since it is larger than the sum of its proper divisors (25459).

2561057 is a wasteful number, since it uses less digits than its factorization.

2561057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25458.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 2561057 is about 1600.3302784113. The cubic root of 2561057 is about 136.8169006912.

The spelling of 2561057 in words is "two million, five hundred sixty-one thousand, fifty-seven".