87009389 has 2 divisors, whose sum is σ = 87009390. Its totient is φ = 87009388.

The previous prime is 87009347. The next prime is 87009397. The reversal of 87009389 is 98390078.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73444900 + 13564489 = 8570^2 + 3683^2 .

It is a cyclic number.

It is not a de Polignac number, because 87009389 - 2¹² = 87005293 is a prime.

It is a super-3 number, since 3×87009389³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87009289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43504694 + 43504695.

It is an arithmetic number, because the mean of its divisors is an integer number (43504695).

Almost surely, 2^87009389 is an apocalyptic number.

It is an amenable number.

87009389 is a deficient number, since it is larger than the sum of its proper divisors (1).

87009389 is an equidigital number, since it uses as much as digits as its factorization.

87009389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 87009389 is about 9327.8823427400. The cubic root of 87009389 is about 443.1207014834.

The spelling of 87009389 in words is "eighty-seven million, nine thousand, three hundred eighty-nine".