87323909 has 2 divisors, whose sum is σ = 87323910. Its totient is φ = 87323908.

The previous prime is 87323903. The next prime is 87323911. The reversal of 87323909 is 90932378.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79744900 + 7579009 = 8930^2 + 2753^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87323909 is a prime.

Together with 87323911, 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 (87323903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43661954 + 43661955.

It is an arithmetic number, because the mean of its divisors is an integer number (43661955).

Almost surely, 2^87323909 is an apocalyptic number.

It is an amenable number.

87323909 is a deficient number, since it is larger than the sum of its proper divisors (1).

87323909 is an equidigital number, since it uses as much as digits as its factorization.

87323909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 87323909 is about 9344.7262667239. The cubic root of 87323909 is about 443.6539877181.

The spelling of 87323909 in words is "eighty-seven million, three hundred twenty-three thousand, nine hundred nine".