84197271181 has 2 divisors, whose sum is σ = 84197271182. Its totient is φ = 84197271180.

The previous prime is 84197271149. The next prime is 84197271211. The reversal of 84197271181 is 18117279148.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83154949956 + 1042321225 = 288366^2 + 32285^2 .

It is a cyclic number.

It is not a de Polignac number, because 84197271181 - 2⁵ = 84197271149 is a prime.

It is a super-2 number, since 2×84197271181² (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 (84197271281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42098635590 + 42098635591.

It is an arithmetic number, because the mean of its divisors is an integer number (42098635591).

Almost surely, 2^84197271181 is an apocalyptic number.

It is an amenable number.

84197271181 is a deficient number, since it is larger than the sum of its proper divisors (1).

84197271181 is an equidigital number, since it uses as much as digits as its factorization.

84197271181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 49.

The spelling of 84197271181 in words is "eighty-four billion, one hundred ninety-seven million, two hundred seventy-one thousand, one hundred eighty-one".