23261 has 4 divisors (see below), whose sum is σ = 26592. Its totient is φ = 19932.

The previous prime is 23251. The next prime is 23269. The reversal of 23261 is 16232.

23261 = T₁₀ + T₁₁ + ... + T₅₁.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23261 - 2⁶ = 23197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1655 + ... + 1668.

It is an arithmetic number, because the mean of its divisors is an integer number (6648).

2²³²⁶¹ is an apocalyptic number.

It is an amenable number.

23261 is a deficient number, since it is larger than the sum of its proper divisors (3331).

23261 is an equidigital number, since it uses as much as digits as its factorization.

23261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3330.

The product of its digits is 72, while the sum is 14.

The square root of 23261 is about 152.5155729754. The cubic root of 23261 is about 28.5458378001.

Adding to 23261 its reverse (16232), we get a palindrome (39493).

The spelling of 23261 in words is "twenty-three thousand, two hundred sixty-one".