87086221 has 2 divisors, whose sum is σ = 87086222. Its totient is φ = 87086220.

The previous prime is 87086213. The next prime is 87086231. The reversal of 87086221 is 12268078.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68475625 + 18610596 = 8275^2 + 4314^2 .

It is a cyclic number.

It is not a de Polignac number, because 87086221 - 2³ = 87086213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87086231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43543110 + 43543111.

It is an arithmetic number, because the mean of its divisors is an integer number (43543111).

Almost surely, 2^87086221 is an apocalyptic number.

It is an amenable number.

87086221 is a deficient number, since it is larger than the sum of its proper divisors (1).

87086221 is an equidigital number, since it uses as much as digits as its factorization.

87086221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 87086221 is about 9331.9998392628. Note that the first 3 decimals coincide. The cubic root of 87086221 is about 443.2510929038.

The spelling of 87086221 in words is "eighty-seven million, eighty-six thousand, two hundred twenty-one".