87196181 has 2 divisors, whose sum is σ = 87196182. Its totient is φ = 87196180.

The previous prime is 87196177. The next prime is 87196189. The reversal of 87196181 is 18169178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60062500 + 27133681 = 7750^2 + 5209^2 .

It is a cyclic number.

It is not a de Polignac number, because 87196181 - 2² = 87196177 is a prime.

It is a super-3 number, since 3×87196181³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87196189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43598090 + 43598091.

It is an arithmetic number, because the mean of its divisors is an integer number (43598091).

Almost surely, 2^87196181 is an apocalyptic number.

It is an amenable number.

87196181 is a deficient number, since it is larger than the sum of its proper divisors (1).

87196181 is an equidigital number, since it uses as much as digits as its factorization.

87196181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 41.

The square root of 87196181 is about 9337.8895367208. The cubic root of 87196181 is about 443.4375724260.

The spelling of 87196181 in words is "eighty-seven million, one hundred ninety-six thousand, one hundred eighty-one".