87318551 has 2 divisors, whose sum is σ = 87318552. Its totient is φ = 87318550.

The previous prime is 87318529. The next prime is 87318571. The reversal of 87318551 is 15581378.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87318551 - 2¹⁴ = 87302167 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87318521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43659275 + 43659276.

It is an arithmetic number, because the mean of its divisors is an integer number (43659276).

Almost surely, 2^87318551 is an apocalyptic number.

87318551 is a deficient number, since it is larger than the sum of its proper divisors (1).

87318551 is an equidigital number, since it uses as much as digits as its factorization.

87318551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33600, while the sum is 38.

The square root of 87318551 is about 9344.4395765610. The cubic root of 87318551 is about 443.6449136600.

The spelling of 87318551 in words is "eighty-seven million, three hundred eighteen thousand, five hundred fifty-one".