81000587 has 2 divisors, whose sum is σ = 81000588. Its totient is φ = 81000586.

The previous prime is 81000583. The next prime is 81000593. The reversal of 81000587 is 78500018.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81000587 - 2² = 81000583 is a prime.

It is a super-2 number, since 2×81000587² = 13122190188689138, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81000583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40500293 + 40500294.

It is an arithmetic number, because the mean of its divisors is an integer number (40500294).

Almost surely, 2^81000587 is an apocalyptic number.

81000587 is a deficient number, since it is larger than the sum of its proper divisors (1).

81000587 is an equidigital number, since it uses as much as digits as its factorization.

81000587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 81000587 is about 9000.0326110520. The cubic root of 81000587 is about 432.6759162755.

The spelling of 81000587 in words is "eighty-one million, five hundred eighty-seven", and thus it is an aban number.