261912 has 32 divisors (see below), whose sum is σ = 748800. Its totient is φ = 74784.

The previous prime is 261887. The next prime is 261917. The reversal of 261912 is 219162.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nialpdrome in base 8.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261917) by changing a digit.

261912 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 7 ways as a sum of consecutive naturals, for example, 612 + ... + 947.

It is an arithmetic number, because the mean of its divisors is an integer number (23400).

2²⁶¹⁹¹² is an apocalyptic number.

It is an amenable number.

261912 is an abundant number, since it is smaller than the sum of its proper divisors (486888).

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

261912 is a wasteful number, since it uses less digits than its factorization.

261912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1575 (or 1571 counting only the distinct ones).

The product of its digits is 216, while the sum is 21.

The square root of 261912 is about 511.7733873503. The cubic root of 261912 is about 63.9811142192.

The spelling of 261912 in words is "two hundred sixty-one thousand, nine hundred twelve".