122581 has 4 divisors (see below), whose sum is σ = 125932. Its totient is φ = 119232.

The previous prime is 122579. The next prime is 122597. The reversal of 122581 is 185221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 111556 + 11025 = 334^2 + 105^2 .

It is a cyclic number.

It is not a de Polignac number, because 122581 - 2¹ = 122579 is a prime.

It is a super-2 number, since 2×122581² = 30052203122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1620 + ... + 1693.

It is an arithmetic number, because the mean of its divisors is an integer number (31483).

2¹²²⁵⁸¹ is an apocalyptic number.

It is an amenable number.

122581 is a deficient number, since it is larger than the sum of its proper divisors (3351).

122581 is an equidigital number, since it uses as much as digits as its factorization.

122581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3350.

The product of its digits is 160, while the sum is 19.

The square root of 122581 is about 350.1156951638. The cubic root of 122581 is about 49.6753634506.

It can be divided in two parts, 1225 and 81, that multiplied together give a square (99225 = 315²).

The spelling of 122581 in words is "one hundred twenty-two thousand, five hundred eighty-one".