87897181 has 2 divisors, whose sum is σ = 87897182. Its totient is φ = 87897180.

The previous prime is 87897151. The next prime is 87897221. The reversal of 87897181 is 18179878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76405081 + 11492100 = 8741^2 + 3390^2 .

It is a cyclic number.

It is not a de Polignac number, because 87897181 - 2⁵ = 87897149 is a prime.

It is a super-2 number, since 2×87897181² = 15451828855493522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87897101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43948590 + 43948591.

It is an arithmetic number, because the mean of its divisors is an integer number (43948591).

Almost surely, 2^87897181 is an apocalyptic number.

It is an amenable number.

87897181 is a deficient number, since it is larger than the sum of its proper divisors (1).

87897181 is an equidigital number, since it uses as much as digits as its factorization.

87897181 is an odious number, because the sum of its binary digits is odd.

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

The square root of 87897181 is about 9375.3496468132. The cubic root of 87897181 is about 444.6227177162.

The spelling of 87897181 in words is "eighty-seven million, eight hundred ninety-seven thousand, one hundred eighty-one".