261622 has 4 divisors (see below), whose sum is σ = 392436. Its totient is φ = 130810.

The previous prime is 261619. The next prime is 261631. The reversal of 261622 is 226162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 226162 = 2 ⋅113081.

It is a self number, because there is not a number n which added to its sum of digits gives 261622.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65404 + ... + 65407.

It is an arithmetic number, because the mean of its divisors is an integer number (98109).

2²⁶¹⁶²² is an apocalyptic number.

261622 is a deficient number, since it is larger than the sum of its proper divisors (130814).

261622 is a wasteful number, since it uses less digits than its factorization.

261622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130813.

The product of its digits is 288, while the sum is 19.

The square root of 261622 is about 511.4899803515. The cubic root of 261622 is about 63.9574913033.

Adding to 261622 its reverse (226162), we get a palindrome (487784).

The spelling of 261622 in words is "two hundred sixty-one thousand, six hundred twenty-two".