261150 has 24 divisors (see below), whose sum is σ = 648024. Its totient is φ = 69600.

The previous prime is 261127. The next prime is 261167. The reversal of 261150 is 51162.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

261150 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 11 ways as a sum of consecutive naturals, for example, 721 + ... + 1020.

It is an arithmetic number, because the mean of its divisors is an integer number (27001).

2²⁶¹¹⁵⁰ is an apocalyptic number.

261150 is an abundant number, since it is smaller than the sum of its proper divisors (386874).

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

261150 is a wasteful number, since it uses less digits than its factorization.

261150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1756 (or 1751 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 261150 is about 511.0283749460. The cubic root of 261150 is about 63.9190056147.

It can be divided in two parts, 26 and 1150, that added together give a triangular number (1176 = T₄₈).

The spelling of 261150 in words is "two hundred sixty-one thousand, one hundred fifty".