87511309 has 2 divisors, whose sum is σ = 87511310. Its totient is φ = 87511308.

The previous prime is 87511289. The next prime is 87511331. The reversal of 87511309 is 90311578.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57426084 + 30085225 = 7578^2 + 5485^2 .

It is a cyclic number.

It is not a de Polignac number, because 87511309 - 2⁷ = 87511181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87511339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43755654 + 43755655.

It is an arithmetic number, because the mean of its divisors is an integer number (43755655).

Almost surely, 2^87511309 is an apocalyptic number.

It is an amenable number.

87511309 is a deficient number, since it is larger than the sum of its proper divisors (1).

87511309 is an equidigital number, since it uses as much as digits as its factorization.

87511309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 87511309 is about 9354.7479388811. The cubic root of 87511309 is about 443.9711263452.

The spelling of 87511309 in words is "eighty-seven million, five hundred eleven thousand, three hundred nine".