84397222181 has 2 divisors, whose sum is σ = 84397222182. Its totient is φ = 84397222180.

The previous prime is 84397222139. The next prime is 84397222219. The reversal of 84397222181 is 18122279348.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84177737956 + 219484225 = 290134^2 + 14815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84397222181 is a prime.

It is a super-2 number, since 2×84397222181² (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 (84397222981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42198611090 + 42198611091.

It is an arithmetic number, because the mean of its divisors is an integer number (42198611091).

Almost surely, 2^84397222181 is an apocalyptic number.

It is an amenable number.

84397222181 is a deficient number, since it is larger than the sum of its proper divisors (1).

84397222181 is an equidigital number, since it uses as much as digits as its factorization.

84397222181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 47.

The spelling of 84397222181 in words is "eighty-four billion, three hundred ninety-seven million, two hundred twenty-two thousand, one hundred eighty-one".