261215 has 8 divisors (see below), whose sum is σ = 317520. Its totient is φ = 206272.

The previous prime is 261169. The next prime is 261223. The reversal of 261215 is 512162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261215 - 2⁸ = 260959 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261193 and 261202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152 + ... + 738.

It is an arithmetic number, because the mean of its divisors is an integer number (39690).

2²⁶¹²¹⁵ is an apocalyptic number.

261215 is a deficient number, since it is larger than the sum of its proper divisors (56305).

261215 is an equidigital number, since it uses as much as digits as its factorization.

261215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681.

The product of its digits is 120, while the sum is 17.

The square root of 261215 is about 511.0919682406. The cubic root of 261215 is about 63.9243083025.

Adding to 261215 its reverse (512162), we get a palindrome (773377).

The spelling of 261215 in words is "two hundred sixty-one thousand, two hundred fifteen".