261722 has 8 divisors (see below), whose sum is σ = 396576. Its totient is φ = 129532.

The previous prime is 261721. The next prime is 261739. The reversal of 261722 is 227162.

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

It is a junction number, because it is equal to n+sod(n) for n = 261694 and 261703.

It is not an unprimeable number, because it can be changed into a prime (261721) 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 3 ways as a sum of consecutive naturals, for example, 398 + ... + 825.

It is an arithmetic number, because the mean of its divisors is an integer number (49572).

2²⁶¹⁷²² is an apocalyptic number.

261722 is a deficient number, since it is larger than the sum of its proper divisors (134854).

261722 is a wasteful number, since it uses less digits than its factorization.

261722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332.

The product of its digits is 336, while the sum is 20.

The square root of 261722 is about 511.5877246377. The cubic root of 261722 is about 63.9656391074.

Adding to 261722 its reverse (227162), we get a palindrome (488884).

The spelling of 261722 in words is "two hundred sixty-one thousand, seven hundred twenty-two".