87824591 has 2 divisors, whose sum is σ = 87824592. Its totient is φ = 87824590.

The previous prime is 87824587. The next prime is 87824599. The reversal of 87824591 is 19542878.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87824591 - 2² = 87824587 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87824599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43912295 + 43912296.

It is an arithmetic number, because the mean of its divisors is an integer number (43912296).

Almost surely, 2^87824591 is an apocalyptic number.

87824591 is a deficient number, since it is larger than the sum of its proper divisors (1).

87824591 is an equidigital number, since it uses as much as digits as its factorization.

87824591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 44.

The square root of 87824591 is about 9371.4775249157. The cubic root of 87824591 is about 444.5002865922.

The spelling of 87824591 in words is "eighty-seven million, eight hundred twenty-four thousand, five hundred ninety-one".