122081581 has 8 divisors (see below), whose sum is σ = 123764984. Its totient is φ = 120407040.

The previous prime is 122081579. The next prime is 122081599. The reversal of 122081581 is 185180221.

It can be written as a sum of positive squares in 4 ways, for example, as 7784100 + 114297481 = 2790^2 + 10691^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 122081581 - 2¹ = 122081579 is a prime.

It is a super-2 number, since 2×122081581² = 29807824838919122, 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 (122081501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28351 + ... + 32371.

It is an arithmetic number, because the mean of its divisors is an integer number (15470623).

Almost surely, 2^122081581 is an apocalyptic number.

It is an amenable number.

122081581 is a deficient number, since it is larger than the sum of its proper divisors (1683403).

122081581 is an equidigital number, since it uses as much as digits as its factorization.

122081581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4431.

The product of its (nonzero) digits is 1280, while the sum is 28.

The square root of 122081581 is about 11049.0533983686. The cubic root of 122081581 is about 496.0780923803.

The spelling of 122081581 in words is "one hundred twenty-two million, eighty-one thousand, five hundred eighty-one".