87135493 has 2 divisors, whose sum is σ = 87135494. Its totient is φ = 87135492.

The previous prime is 87135491. The next prime is 87135541. The reversal of 87135493 is 39453178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72982849 + 14152644 = 8543^2 + 3762^2 .

It is a cyclic number.

It is not a de Polignac number, because 87135493 - 2¹ = 87135491 is a prime.

Together with 87135491, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87135491) 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, 43567746 + 43567747.

It is an arithmetic number, because the mean of its divisors is an integer number (43567747).

Almost surely, 2^87135493 is an apocalyptic number.

It is an amenable number.

87135493 is a deficient number, since it is larger than the sum of its proper divisors (1).

87135493 is an equidigital number, since it uses as much as digits as its factorization.

87135493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The square root of 87135493 is about 9334.6394145677. The cubic root of 87135493 is about 443.3346719515.

The spelling of 87135493 in words is "eighty-seven million, one hundred thirty-five thousand, four hundred ninety-three".