87844213 has 2 divisors, whose sum is σ = 87844214. Its totient is φ = 87844212.

The previous prime is 87844193. The next prime is 87844223. The reversal of 87844213 is 31244878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85045284 + 2798929 = 9222^2 + 1673^2 .

It is a cyclic number.

It is not a de Polignac number, because 87844213 - 2¹⁷ = 87713141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87844223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43922106 + 43922107.

It is an arithmetic number, because the mean of its divisors is an integer number (43922107).

Almost surely, 2^87844213 is an apocalyptic number.

It is an amenable number.

87844213 is a deficient number, since it is larger than the sum of its proper divisors (1).

87844213 is an equidigital number, since it uses as much as digits as its factorization.

87844213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43008, while the sum is 37.

The square root of 87844213 is about 9372.5243664661. The cubic root of 87844213 is about 444.5333879330.

The spelling of 87844213 in words is "eighty-seven million, eight hundred forty-four thousand, two hundred thirteen".