87310009 has 2 divisors, whose sum is σ = 87310010. Its totient is φ = 87310008.

The previous prime is 87310007. The next prime is 87310021. The reversal of 87310009 is 90001378.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55353600 + 31956409 = 7440^2 + 5653^2 .

It is a cyclic number.

It is not a de Polignac number, because 87310009 - 2¹ = 87310007 is a prime.

Together with 87310007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (87310007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43655004 + 43655005.

It is an arithmetic number, because the mean of its divisors is an integer number (43655005).

Almost surely, 2^87310009 is an apocalyptic number.

It is an amenable number.

87310009 is a deficient number, since it is larger than the sum of its proper divisors (1).

87310009 is an equidigital number, since it uses as much as digits as its factorization.

87310009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 87310009 is about 9343.9825021240. The cubic root of 87310009 is about 443.6304465607.

The spelling of 87310009 in words is "eighty-seven million, three hundred ten thousand, nine".