87315909 has 4 divisors (see below), whose sum is σ = 116421216. Its totient is φ = 58210604.

The previous prime is 87315869. The next prime is 87315911. The reversal of 87315909 is 90951378.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87315909 - 2⁸ = 87315653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87315919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14552649 + ... + 14552654.

It is an arithmetic number, because the mean of its divisors is an integer number (29105304).

Almost surely, 2^87315909 is an apocalyptic number.

It is an amenable number.

87315909 is a deficient number, since it is larger than the sum of its proper divisors (29105307).

87315909 is a wasteful number, since it uses less digits than its factorization.

87315909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29105306.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 87315909 is about 9344.2982079983. The cubic root of 87315909 is about 443.6404391557.

The spelling of 87315909 in words is "eighty-seven million, three hundred fifteen thousand, nine hundred nine".