87213311 has 4 divisors (see below), whose sum is σ = 87408000. Its totient is φ = 87018624.

The previous prime is 87213289. The next prime is 87213317. The reversal of 87213311 is 11331278.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87213311 - 2¹⁸ = 86951167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87213317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96671 + ... + 97568.

It is an arithmetic number, because the mean of its divisors is an integer number (21852000).

Almost surely, 2^87213311 is an apocalyptic number.

87213311 is a deficient number, since it is larger than the sum of its proper divisors (194689).

87213311 is a wasteful number, since it uses less digits than its factorization.

87213311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194688.

The product of its digits is 1008, while the sum is 26.

The square root of 87213311 is about 9338.8067224887. The cubic root of 87213311 is about 443.4666088209.

Adding to 87213311 its reverse (11331278), we get a palindrome (98544589).

The spelling of 87213311 in words is "eighty-seven million, two hundred thirteen thousand, three hundred eleven".