87513823 has 2 divisors, whose sum is σ = 87513824. Its totient is φ = 87513822.

The previous prime is 87513821. The next prime is 87513863. The reversal of 87513823 is 32831578.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87513823 - 2¹ = 87513821 is a prime.

Together with 87513821, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87513821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43756911 + 43756912.

It is an arithmetic number, because the mean of its divisors is an integer number (43756912).

Almost surely, 2^87513823 is an apocalyptic number.

87513823 is a deficient number, since it is larger than the sum of its proper divisors (1).

87513823 is an equidigital number, since it uses as much as digits as its factorization.

87513823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 37.

The square root of 87513823 is about 9354.8823081854. The cubic root of 87513823 is about 443.9753777299.

The spelling of 87513823 in words is "eighty-seven million, five hundred thirteen thousand, eight hundred twenty-three".