87445591 has 2 divisors, whose sum is σ = 87445592. Its totient is φ = 87445590.

The previous prime is 87445583. The next prime is 87445613. The reversal of 87445591 is 19554478.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87445591 - 2³ = 87445583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87445571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43722795 + 43722796.

It is an arithmetic number, because the mean of its divisors is an integer number (43722796).

Almost surely, 2^87445591 is an apocalyptic number.

87445591 is a deficient number, since it is larger than the sum of its proper divisors (1).

87445591 is an equidigital number, since it uses as much as digits as its factorization.

87445591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 43.

The square root of 87445591 is about 9351.2347313069. The cubic root of 87445591 is about 443.8599628035.

The spelling of 87445591 in words is "eighty-seven million, four hundred forty-five thousand, five hundred ninety-one".