87526181 has 2 divisors, whose sum is σ = 87526182. Its totient is φ = 87526180.

The previous prime is 87526177. The next prime is 87526189. The reversal of 87526181 is 18162578.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77704225 + 9821956 = 8815^2 + 3134^2 .

It is a cyclic number.

It is not a de Polignac number, because 87526181 - 2² = 87526177 is a prime.

It is a super-2 number, since 2×87526181² = 15321664720889522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87526189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43763090 + 43763091.

It is an arithmetic number, because the mean of its divisors is an integer number (43763091).

Almost surely, 2^87526181 is an apocalyptic number.

It is an amenable number.

87526181 is a deficient number, since it is larger than the sum of its proper divisors (1).

87526181 is an equidigital number, since it uses as much as digits as its factorization.

87526181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 38.

The square root of 87526181 is about 9355.5427955838. The cubic root of 87526181 is about 443.9962749600.

The spelling of 87526181 in words is "eighty-seven million, five hundred twenty-six thousand, one hundred eighty-one".