122157681 has 8 divisors (see below), whose sum is σ = 163176864. Its totient is φ = 81288480.

The previous prime is 122157677. The next prime is 122157703. The reversal of 122157681 is 186751221.

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

It is not a de Polignac number, because 122157681 - 2² = 122157677 is a prime.

It is a super-2 number, since 2×122157681² = 29844998054595522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (122157881) 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 7 ways as a sum of consecutive naturals, for example, 35580 + ... + 38861.

It is an arithmetic number, because the mean of its divisors is an integer number (20397108).

Almost surely, 2^122157681 is an apocalyptic number.

It is an amenable number.

122157681 is a deficient number, since it is larger than the sum of its proper divisors (41019183).

122157681 is an equidigital number, since it uses as much as digits as its factorization.

122157681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74991.

The product of its digits is 6720, while the sum is 33.

The square root of 122157681 is about 11052.4965957923. The cubic root of 122157681 is about 496.1811483342.

The spelling of 122157681 in words is "one hundred twenty-two million, one hundred fifty-seven thousand, six hundred eighty-one".