261715 has 8 divisors (see below), whose sum is σ = 332640. Its totient is φ = 196992.

The previous prime is 261713. The next prime is 261721. The reversal of 261715 is 517162.

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 261715 - 2¹ = 261713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1455 + ... + 1624.

It is an arithmetic number, because the mean of its divisors is an integer number (41580).

2²⁶¹⁷¹⁵ is an apocalyptic number.

261715 is a deficient number, since it is larger than the sum of its proper divisors (70925).

261715 is a wasteful number, since it uses less digits than its factorization.

261715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3101.

The product of its digits is 420, while the sum is 22.

The square root of 261715 is about 511.5808831456. The cubic root of 261715 is about 63.9650688287.

Adding to 261715 its reverse (517162), we get a palindrome (778877).

The spelling of 261715 in words is "two hundred sixty-one thousand, seven hundred fifteen".