122445781 has 4 divisors (see below), whose sum is σ = 129648492. Its totient is φ = 115243072.

The previous prime is 122445779. The next prime is 122445797. The reversal of 122445781 is 187544221.

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 61371556 + 61074225 = 7834^2 + 7815^2 .

It is a cyclic number.

It is not a de Polignac number, because 122445781 - 2¹ = 122445779 is a prime.

It is a super-2 number, since 2×122445781² = 29985938569399922, 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 (122445761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3601330 + ... + 3601363.

It is an arithmetic number, because the mean of its divisors is an integer number (32412123).

Almost surely, 2^122445781 is an apocalyptic number.

It is an amenable number.

122445781 is a deficient number, since it is larger than the sum of its proper divisors (7202711).

122445781 is an equidigital number, since it uses as much as digits as its factorization.

122445781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7202710.

The product of its digits is 17920, while the sum is 34.

The square root of 122445781 is about 11065.5221747552. The cubic root of 122445781 is about 496.5709111276.

The spelling of 122445781 in words is "one hundred twenty-two million, four hundred forty-five thousand, seven hundred eighty-one".