122155681 has 2 divisors, whose sum is σ = 122155682. Its totient is φ = 122155680.

The previous prime is 122155661. The next prime is 122155723. The reversal of 122155681 is 186551221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113209600 + 8946081 = 10640^2 + 2991^2 .

It is a cyclic number.

It is not a de Polignac number, because 122155681 - 2²¹ = 120058529 is a prime.

It is a super-2 number, since 2×122155681² = 29844020801147522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (122155651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61077840 + 61077841.

It is an arithmetic number, because the mean of its divisors is an integer number (61077841).

Almost surely, 2^122155681 is an apocalyptic number.

It is an amenable number.

122155681 is a deficient number, since it is larger than the sum of its proper divisors (1).

122155681 is an equidigital number, since it uses as much as digits as its factorization.

122155681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 31.

The square root of 122155681 is about 11052.4061181265. The cubic root of 122155681 is about 496.1784404469.

The spelling of 122155681 in words is "one hundred twenty-two million, one hundred fifty-five thousand, six hundred eighty-one".