122543581 has 4 divisors (see below), whose sum is σ = 122576032. Its totient is φ = 122511132.

The previous prime is 122543543. The next prime is 122543587. The reversal of 122543581 is 185345221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 122543581 - 2²¹ = 120446429 is a prime.

It is a super-2 number, since 2×122543581² = 30033858488607122, 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 (122543587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9681 + ... + 18406.

It is an arithmetic number, because the mean of its divisors is an integer number (30644008).

Almost surely, 2^122543581 is an apocalyptic number.

It is an amenable number.

122543581 is a deficient number, since it is larger than the sum of its proper divisors (32451).

122543581 is an equidigital number, since it uses as much as digits as its factorization.

122543581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32450.

The product of its digits is 9600, while the sum is 31.

The square root of 122543581 is about 11069.9404244106. The cubic root of 122543581 is about 496.7030831268.

The spelling of 122543581 in words is "one hundred twenty-two million, five hundred forty-three thousand, five hundred eighty-one".