87319289 has 2 divisors, whose sum is σ = 87319290. Its totient is φ = 87319288.

The previous prime is 87319277. The next prime is 87319321. The reversal of 87319289 is 98291378.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81144064 + 6175225 = 9008^2 + 2485^2 .

It is a cyclic number.

It is not a de Polignac number, because 87319289 - 2¹⁶ = 87253753 is a prime.

It is not a weakly prime, because it can be changed into another prime (87319489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43659644 + 43659645.

It is an arithmetic number, because the mean of its divisors is an integer number (43659645).

Almost surely, 2^87319289 is an apocalyptic number.

It is an amenable number.

87319289 is a deficient number, since it is larger than the sum of its proper divisors (1).

87319289 is an equidigital number, since it uses as much as digits as its factorization.

87319289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 47.

The square root of 87319289 is about 9344.4790652021. The cubic root of 87319289 is about 443.6461635243.

The spelling of 87319289 in words is "eighty-seven million, three hundred nineteen thousand, two hundred eighty-nine".