87213443 has 2 divisors, whose sum is σ = 87213444. Its totient is φ = 87213442.

The previous prime is 87213391. The next prime is 87213457. The reversal of 87213443 is 34431278.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87213443 - 2¹² = 87209347 is a prime.

It is equal to p_5064881 and since 87213443 and 5064881 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (87203443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43606721 + 43606722.

It is an arithmetic number, because the mean of its divisors is an integer number (43606722).

Almost surely, 2^87213443 is an apocalyptic number.

87213443 is a deficient number, since it is larger than the sum of its proper divisors (1).

87213443 is an equidigital number, since it uses as much as digits as its factorization.

87213443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 32.

The square root of 87213443 is about 9338.8137897701. The cubic root of 87213443 is about 443.4668325542.

The spelling of 87213443 in words is "eighty-seven million, two hundred thirteen thousand, four hundred forty-three".