81882587 has 2 divisors, whose sum is σ = 81882588. Its totient is φ = 81882586.

The previous prime is 81882583. The next prime is 81882589. The reversal of 81882587 is 78528818.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81882587 - 2² = 81882583 is a prime.

Together with 81882589, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81882583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40941293 + 40941294.

It is an arithmetic number, because the mean of its divisors is an integer number (40941294).

Almost surely, 2^81882587 is an apocalyptic number.

81882587 is a deficient number, since it is larger than the sum of its proper divisors (1).

81882587 is an equidigital number, since it uses as much as digits as its factorization.

81882587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 286720, while the sum is 47.

The square root of 81882587 is about 9048.8997673750. The cubic root of 81882587 is about 434.2406923725.

The spelling of 81882587 in words is "eighty-one million, eight hundred eighty-two thousand, five hundred eighty-seven".