87089909 has 2 divisors, whose sum is σ = 87089910. Its totient is φ = 87089908.

The previous prime is 87089903. The next prime is 87089911. The reversal of 87089909 is 90998078.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53333809 + 33756100 = 7303^2 + 5810^2 .

It is a cyclic number.

It is not a de Polignac number, because 87089909 - 2¹² = 87085813 is a prime.

Together with 87089911, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87089903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43544954 + 43544955.

It is an arithmetic number, because the mean of its divisors is an integer number (43544955).

Almost surely, 2^87089909 is an apocalyptic number.

It is an amenable number.

87089909 is a deficient number, since it is larger than the sum of its proper divisors (1).

87089909 is an equidigital number, since it uses as much as digits as its factorization.

87089909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 87089909 is about 9332.1974368313. The cubic root of 87089909 is about 443.2573498713.

The spelling of 87089909 in words is "eighty-seven million, eighty-nine thousand, nine hundred nine".