87681229 has 2 divisors, whose sum is σ = 87681230. Its totient is φ = 87681228.

The previous prime is 87681211. The next prime is 87681259. The reversal of 87681229 is 92218678.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83229129 + 4452100 = 9123^2 + 2110^2 .

It is a cyclic number.

It is not a de Polignac number, because 87681229 - 2¹¹ = 87679181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87681259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43840614 + 43840615.

It is an arithmetic number, because the mean of its divisors is an integer number (43840615).

Almost surely, 2^87681229 is an apocalyptic number.

It is an amenable number.

87681229 is a deficient number, since it is larger than the sum of its proper divisors (1).

87681229 is an equidigital number, since it uses as much as digits as its factorization.

87681229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 43.

The square root of 87681229 is about 9363.8255536933. The cubic root of 87681229 is about 444.2582922763.

The spelling of 87681229 in words is "eighty-seven million, six hundred eighty-one thousand, two hundred twenty-nine".