261236 has 6 divisors (see below), whose sum is σ = 457170. Its totient is φ = 130616.

The previous prime is 261229. The next prime is 261241. The reversal of 261236 is 632162.

It can be written as a sum of positive squares in only one way, i.e., 250000 + 11236 = 500^2 + 106^2 .

It is a super-3 number, since 3×261236³ = 53483562873336768, which contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

261236 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 as a sum of consecutive naturals, namely, 32651 + ... + 32658.

It is an arithmetic number, because the mean of its divisors is an integer number (76195).

2²⁶¹²³⁶ is an apocalyptic number.

It is an amenable number.

261236 is a deficient number, since it is larger than the sum of its proper divisors (195934).

261236 is a wasteful number, since it uses less digits than its factorization.

261236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65313 (or 65311 counting only the distinct ones).

The product of its digits is 432, while the sum is 20.

The square root of 261236 is about 511.1125120754. The cubic root of 261236 is about 63.9260212905.

Adding to 261236 its reverse (632162), we get a palindrome (893398).

The spelling of 261236 in words is "two hundred sixty-one thousand, two hundred thirty-six".