87322231 has 2 divisors, whose sum is σ = 87322232. Its totient is φ = 87322230.

The previous prime is 87322229. The next prime is 87322241. The reversal of 87322231 is 13222378.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87322231 - 2¹ = 87322229 is a prime.

It is a super-2 number, since 2×87322231² = 15250344053634722, which contains 22 as substring.

Together with 87322229, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 87322231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87322211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43661115 + 43661116.

It is an arithmetic number, because the mean of its divisors is an integer number (43661116).

Almost surely, 2^87322231 is an apocalyptic number.

87322231 is a deficient number, since it is larger than the sum of its proper divisors (1).

87322231 is an equidigital number, since it uses as much as digits as its factorization.

87322231 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 87322231 is about 9344.6364830313. The cubic root of 87322231 is about 443.6511459757.

It can be divided in two parts, 873 and 22231, that added together give a square (23104 = 152²).

The spelling of 87322231 in words is "eighty-seven million, three hundred twenty-two thousand, two hundred thirty-one".