87232213 has 2 divisors, whose sum is σ = 87232214. Its totient is φ = 87232212.

The previous prime is 87232207. The next prime is 87232217. The reversal of 87232213 is 31223278.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46553329 + 40678884 = 6823^2 + 6378^2 .

It is a cyclic number.

It is not a de Polignac number, because 87232213 - 2⁹ = 87231701 is a prime.

It is equal to p_5065921 and since 87232213 and 5065921 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87232217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43616106 + 43616107.

It is an arithmetic number, because the mean of its divisors is an integer number (43616107).

Almost surely, 2^87232213 is an apocalyptic number.

It is an amenable number.

87232213 is a deficient number, since it is larger than the sum of its proper divisors (1).

87232213 is an equidigital number, since it uses as much as digits as its factorization.

87232213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 28.

The square root of 87232213 is about 9339.8186813235. The cubic root of 87232213 is about 443.4986444519.

The spelling of 87232213 in words is "eighty-seven million, two hundred thirty-two thousand, two hundred thirteen".