2561550 has 24 divisors (see below), whose sum is σ = 6353016. Its totient is φ = 683040.

The previous prime is 2561549. The next prime is 2561551. The reversal of 2561550 is 551652.

It is an interprime number because it is at equal distance from previous prime (2561549) and next prime (2561551).

It is a self number, because there is not a number n which added to its sum of digits gives 2561550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561551) 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, 8389 + ... + 8688.

It is an arithmetic number, because the mean of its divisors is an integer number (264709).

2^2561550 is an apocalyptic number.

2561550 is an abundant number, since it is smaller than the sum of its proper divisors (3791466).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2561550 is a wasteful number, since it uses less digits than its factorization.

2561550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17092 (or 17087 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 2561550 is about 1600.4843017037. The cubic root of 2561550 is about 136.8256791505.

The spelling of 2561550 in words is "two million, five hundred sixty-one thousand, five hundred fifty".