261552 has 20 divisors (see below), whose sum is σ = 675800. Its totient is φ = 87168.

The previous prime is 261529. The next prime is 261557. The reversal of 261552 is 255162.

It is a nialpdrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261557) by changing a digit.

261552 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2677 + ... + 2772.

It is an arithmetic number, because the mean of its divisors is an integer number (33790).

2²⁶¹⁵⁵² is an apocalyptic number.

It is an amenable number.

261552 is an abundant number, since it is smaller than the sum of its proper divisors (414248).

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

261552 is a wasteful number, since it uses less digits than its factorization.

261552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5460 (or 5454 counting only the distinct ones).

The product of its digits is 600, while the sum is 21.

The square root of 261552 is about 511.4215482359. The cubic root of 261552 is about 63.9517866050.

The spelling of 261552 in words is "two hundred sixty-one thousand, five hundred fifty-two".