122566981 has 2 divisors, whose sum is σ = 122566982. Its totient is φ = 122566980.

The previous prime is 122566949. The next prime is 122567009. The reversal of 122566981 is 189665221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121198081 + 1368900 = 11009^2 + 1170^2 .

It is a cyclic number.

It is not a de Polignac number, because 122566981 - 2⁵ = 122566949 is a prime.

It is a super-2 number, since 2×122566981² = 30045329662908722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122566181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61283490 + 61283491.

It is an arithmetic number, because the mean of its divisors is an integer number (61283491).

Almost surely, 2^122566981 is an apocalyptic number.

It is an amenable number.

122566981 is a deficient number, since it is larger than the sum of its proper divisors (1).

122566981 is an equidigital number, since it uses as much as digits as its factorization.

122566981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 40.

The square root of 122566981 is about 11070.9972902174. The cubic root of 122566981 is about 496.7346966755.

The spelling of 122566981 in words is "one hundred twenty-two million, five hundred sixty-six thousand, nine hundred eighty-one".