422450051981 has 2 divisors, whose sum is σ = 422450051982. Its totient is φ = 422450051980.

The previous prime is 422450051977. The next prime is 422450052061. The reversal of 422450051981 is 189150054224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 267009892900 + 155440159081 = 516730^2 + 394259^2 .

It is a cyclic number.

It is not a de Polignac number, because 422450051981 - 2² = 422450051977 is a prime.

It is a super-2 number, since 2×422450051981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (422450051951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211225025990 + 211225025991.

It is an arithmetic number, because the mean of its divisors is an integer number (211225025991).

Almost surely, 2^422450051981 is an apocalyptic number.

It is an amenable number.

422450051981 is a deficient number, since it is larger than the sum of its proper divisors (1).

422450051981 is an equidigital number, since it uses as much as digits as its factorization.

422450051981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 115200, while the sum is 41.

The spelling of 422450051981 in words is "four hundred twenty-two billion, four hundred fifty million, fifty-one thousand, nine hundred eighty-one".