87133213 has 2 divisors, whose sum is σ = 87133214. Its totient is φ = 87133212.

The previous prime is 87133201. The next prime is 87133217. The reversal of 87133213 is 31233178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43599609 + 43533604 = 6603^2 + 6598^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87133213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87133217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43566606 + 43566607.

It is an arithmetic number, because the mean of its divisors is an integer number (43566607).

Almost surely, 2^87133213 is an apocalyptic number.

It is an amenable number.

87133213 is a deficient number, since it is larger than the sum of its proper divisors (1).

87133213 is an equidigital number, since it uses as much as digits as its factorization.

87133213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 28.

The square root of 87133213 is about 9334.5172880016. The cubic root of 87133213 is about 443.3308051313.

The spelling of 87133213 in words is "eighty-seven million, one hundred thirty-three thousand, two hundred thirteen".