87531329 has 2 divisors, whose sum is σ = 87531330. Its totient is φ = 87531328.

The previous prime is 87531319. The next prime is 87531331. The reversal of 87531329 is 92313578.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79691329 + 7840000 = 8927^2 + 2800^2 .

It is a cyclic number.

It is not a de Polignac number, because 87531329 - 2⁴ = 87531313 is a prime.

Together with 87531331, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 87531292 and 87531301.

It is not a weakly prime, because it can be changed into another prime (87531319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43765664 + 43765665.

It is an arithmetic number, because the mean of its divisors is an integer number (43765665).

Almost surely, 2^87531329 is an apocalyptic number.

It is an amenable number.

87531329 is a deficient number, since it is larger than the sum of its proper divisors (1).

87531329 is an equidigital number, since it uses as much as digits as its factorization.

87531329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 38.

The square root of 87531329 is about 9355.8179225549. The cubic root of 87531329 is about 444.0049795860.

The spelling of 87531329 in words is "eighty-seven million, five hundred thirty-one thousand, three hundred twenty-nine".