87549317 has 2 divisors, whose sum is σ = 87549318. Its totient is φ = 87549316.

The previous prime is 87549311. The next prime is 87549367. The reversal of 87549317 is 71394578.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87347716 + 201601 = 9346^2 + 449^2 .

It is a cyclic number.

It is not a de Polignac number, because 87549317 - 2⁸ = 87549061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87549311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43774658 + 43774659.

It is an arithmetic number, because the mean of its divisors is an integer number (43774659).

Almost surely, 2^87549317 is an apocalyptic number.

It is an amenable number.

87549317 is a deficient number, since it is larger than the sum of its proper divisors (1).

87549317 is an equidigital number, since it uses as much as digits as its factorization.

87549317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 44.

The square root of 87549317 is about 9356.7792001308. The cubic root of 87549317 is about 444.0353923712.

The spelling of 87549317 in words is "eighty-seven million, five hundred forty-nine thousand, three hundred seventeen".