2561837 has 4 divisors (see below), whose sum is σ = 2565120. Its totient is φ = 2558556.

The previous prime is 2561833. The next prime is 2561857. The reversal of 2561837 is 7381652.

It is a happy number.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2561837 - 2² = 2561833 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561833) 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, 278 + ... + 2280.

It is an arithmetic number, because the mean of its divisors is an integer number (641280).

2^2561837 is an apocalyptic number.

It is an amenable number.

2561837 is a deficient number, since it is larger than the sum of its proper divisors (3283).

2561837 is a wasteful number, since it uses less digits than its factorization.

2561837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3282.

The product of its digits is 10080, while the sum is 32.

The square root of 2561837 is about 1600.5739595533. The cubic root of 2561837 is about 136.8307890128.

The spelling of 2561837 in words is "two million, five hundred sixty-one thousand, eight hundred thirty-seven".