87133217 has 2 divisors, whose sum is σ = 87133218. Its totient is φ = 87133216.

The previous prime is 87133213. The next prime is 87133229. The reversal of 87133217 is 71233178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45711121 + 41422096 = 6761^2 + 6436^2 .

It is a cyclic number.

It is not a de Polignac number, because 87133217 - 2² = 87133213 is a prime.

It is not a weakly prime, because it can be changed into another prime (87133213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43566608 + 43566609.

It is an arithmetic number, because the mean of its divisors is an integer number (43566609).

Almost surely, 2^87133217 is an apocalyptic number.

It is an amenable number.

87133217 is a deficient number, since it is larger than the sum of its proper divisors (1).

87133217 is an equidigital number, since it uses as much as digits as its factorization.

87133217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 32.

The square root of 87133217 is about 9334.5175022601. The cubic root of 87133217 is about 443.3308119152.

The spelling of 87133217 in words is "eighty-seven million, one hundred thirty-three thousand, two hundred seventeen".