87358781 has 2 divisors, whose sum is σ = 87358782. Its totient is φ = 87358780.

The previous prime is 87358723. The next prime is 87358819. The reversal of 87358781 is 18785378.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87123556 + 235225 = 9334^2 + 485^2 .

It is a cyclic number.

It is not a de Polignac number, because 87358781 - 2⁶ = 87358717 is a prime.

It is a super-2 number, since 2×87358781² = 15263113235611922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87358721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43679390 + 43679391.

It is an arithmetic number, because the mean of its divisors is an integer number (43679391).

Almost surely, 2^87358781 is an apocalyptic number.

It is an amenable number.

87358781 is a deficient number, since it is larger than the sum of its proper divisors (1).

87358781 is an equidigital number, since it uses as much as digits as its factorization.

87358781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 376320, while the sum is 47.

The square root of 87358781 is about 9346.5919457308. The cubic root of 87358781 is about 443.7130362387.

The spelling of 87358781 in words is "eighty-seven million, three hundred fifty-eight thousand, seven hundred eighty-one".