2561707 has 4 divisors (see below), whose sum is σ = 2570256. Its totient is φ = 2553160.

The previous prime is 2561683. The next prime is 2561723. The reversal of 2561707 is 7071652.

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

It is a cyclic number.

It is not a de Polignac number, because 2561707 - 2¹⁹ = 2037419 is a prime.

It is a Duffinian number.

2561707 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2561737) 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, 3808 + ... + 4429.

It is an arithmetic number, because the mean of its divisors is an integer number (642564).

2^2561707 is an apocalyptic number.

2561707 is a deficient number, since it is larger than the sum of its proper divisors (8549).

2561707 is an equidigital number, since it uses as much as digits as its factorization.

2561707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8548.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 2561707 is about 1600.5333486060. The cubic root of 2561707 is about 136.8284744883.

The spelling of 2561707 in words is "two million, five hundred sixty-one thousand, seven hundred seven".