87012509 has 2 divisors, whose sum is σ = 87012510. Its totient is φ = 87012508.

The previous prime is 87012487. The next prime is 87012517. The reversal of 87012509 is 90521078.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86081284 + 931225 = 9278^2 + 965^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87012509 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87012529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43506254 + 43506255.

It is an arithmetic number, because the mean of its divisors is an integer number (43506255).

Almost surely, 2^87012509 is an apocalyptic number.

It is an amenable number.

87012509 is a deficient number, since it is larger than the sum of its proper divisors (1).

87012509 is an equidigital number, since it uses as much as digits as its factorization.

87012509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 87012509 is about 9328.0495817722. The cubic root of 87012509 is about 443.1259979235.

The spelling of 87012509 in words is "eighty-seven million, twelve thousand, five hundred nine".