261015 has 8 divisors (see below), whose sum is σ = 417648. Its totient is φ = 139200.

The previous prime is 261013. The next prime is 261017. The reversal of 261015 is 510162.

It is an interprime number because it is at equal distance from previous prime (261013) and next prime (261017).

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

It is not a de Polignac number, because 261015 - 2¹ = 261013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 17401 = 261015 / (2 + 6 + 1 + 0 + 1 + 5).

It is a junction number, because it is equal to n+sod(n) for n = 260985 and 261003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8686 + ... + 8715.

It is an arithmetic number, because the mean of its divisors is an integer number (52206).

2²⁶¹⁰¹⁵ is an apocalyptic number.

261015 is a deficient number, since it is larger than the sum of its proper divisors (156633).

261015 is a wasteful number, since it uses less digits than its factorization.

261015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17409.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 261015 is about 510.8962712724. The cubic root of 261015 is about 63.9079895281.

Adding to 261015 its reverse (510162), we get a palindrome (771177).

It can be divided in two parts, 26101 and 5, that added together give a triangular number (26106 = T₂₂₈).

The spelling of 261015 in words is "two hundred sixty-one thousand, fifteen".