87311789 has 2 divisors, whose sum is σ = 87311790. Its totient is φ = 87311788.

The previous prime is 87311771. The next prime is 87311839. The reversal of 87311789 is 98711378.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52678564 + 34633225 = 7258^2 + 5885^2 .

It is a cyclic number.

It is not a de Polignac number, because 87311789 - 2⁸ = 87311533 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87311089) 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, 43655894 + 43655895.

It is an arithmetic number, because the mean of its divisors is an integer number (43655895).

Almost surely, 2^87311789 is an apocalyptic number.

It is an amenable number.

87311789 is a deficient number, since it is larger than the sum of its proper divisors (1).

87311789 is an equidigital number, since it uses as much as digits as its factorization.

87311789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 44.

The square root of 87311789 is about 9344.0777501046. The cubic root of 87311789 is about 443.6334613232.

The spelling of 87311789 in words is "eighty-seven million, three hundred eleven thousand, seven hundred eighty-nine".