122204311981 has 2 divisors, whose sum is σ = 122204311982. Its totient is φ = 122204311980.

The previous prime is 122204311961. The next prime is 122204312017. The reversal of 122204311981 is 189113402221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74632776100 + 47571535881 = 273190^2 + 218109^2 .

It is a cyclic number.

It is not a de Polignac number, because 122204311981 - 2¹³ = 122204303789 is a prime.

It is a super-2 number, since 2×122204311981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122204311961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61102155990 + 61102155991.

It is an arithmetic number, because the mean of its divisors is an integer number (61102155991).

Almost surely, 2^122204311981 is an apocalyptic number.

It is an amenable number.

122204311981 is a deficient number, since it is larger than the sum of its proper divisors (1).

122204311981 is an equidigital number, since it uses as much as digits as its factorization.

122204311981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 34.

The spelling of 122204311981 in words is "one hundred twenty-two billion, two hundred four million, three hundred eleven thousand, nine hundred eighty-one".