81270587 has 2 divisors, whose sum is σ = 81270588. Its totient is φ = 81270586.

The previous prime is 81270551. The next prime is 81270589. The reversal of 81270587 is 78507218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81270587 - 2⁸ = 81270331 is a prime.

It is a super-2 number, since 2×81270587² = 13209816622649138, which contains 22 as substring.

Together with 81270589, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 81270587.

It is not a weakly prime, because it can be changed into another prime (81270589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40635293 + 40635294.

It is an arithmetic number, because the mean of its divisors is an integer number (40635294).

Almost surely, 2^81270587 is an apocalyptic number.

81270587 is a deficient number, since it is larger than the sum of its proper divisors (1).

81270587 is an equidigital number, since it uses as much as digits as its factorization.

81270587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 81270587 is about 9015.0200776260. The cubic root of 81270587 is about 433.1561306366.

The spelling of 81270587 in words is "eighty-one million, two hundred seventy thousand, five hundred eighty-seven".