122742581 has 4 divisors (see below), whose sum is σ = 132184332. Its totient is φ = 113300832.

The previous prime is 122742577. The next prime is 122742583. The reversal of 122742581 is 185247221.

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 22562500 + 100180081 = 4750^2 + 10009^2 .

It is a cyclic number.

It is not a de Polignac number, because 122742581 - 2² = 122742577 is a prime.

It is a super-2 number, since 2×122742581² = 30131482381083122, 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 (122742583) 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, 4720856 + ... + 4720881.

It is an arithmetic number, because the mean of its divisors is an integer number (33046083).

Almost surely, 2^122742581 is an apocalyptic number.

It is an amenable number.

122742581 is a deficient number, since it is larger than the sum of its proper divisors (9441751).

122742581 is an equidigital number, since it uses as much as digits as its factorization.

122742581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9441750.

The product of its digits is 8960, while the sum is 32.

The square root of 122742581 is about 11078.9250832380. The cubic root of 122742581 is about 496.9718050958.

The spelling of 122742581 in words is "one hundred twenty-two million, seven hundred forty-two thousand, five hundred eighty-one".