261336 has 16 divisors (see below), whose sum is σ = 653400. Its totient is φ = 87104.

The previous prime is 261329. The next prime is 261337. The reversal of 261336 is 633162.

It is a nude number because it is divisible by every one of its digits.

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 (261337) by changing a digit.

261336 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, 5421 + ... + 5468.

2²⁶¹³³⁶ is an apocalyptic number.

It is an amenable number.

261336 is an abundant number, since it is smaller than the sum of its proper divisors (392064).

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

261336 is a wasteful number, since it uses less digits than its factorization.

261336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10898 (or 10894 counting only the distinct ones).

The product of its digits is 648, while the sum is 21.

The square root of 261336 is about 511.2103285342. The cubic root of 261336 is about 63.9341771172.

Adding to 261336 its reverse (633162), we get a palindrome (894498).

The spelling of 261336 in words is "two hundred sixty-one thousand, three hundred thirty-six".