81927887 has 2 divisors, whose sum is σ = 81927888. Its totient is φ = 81927886.

The previous prime is 81927883. The next prime is 81927917. The reversal of 81927887 is 78872918.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81927887 - 2² = 81927883 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81927883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40963943 + 40963944.

It is an arithmetic number, because the mean of its divisors is an integer number (40963944).

Almost surely, 2^81927887 is an apocalyptic number.

81927887 is a deficient number, since it is larger than the sum of its proper divisors (1).

81927887 is an equidigital number, since it uses as much as digits as its factorization.

81927887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 451584, while the sum is 50.

The square root of 81927887 is about 9051.4024880126. The cubic root of 81927887 is about 434.3207561062.

The spelling of 81927887 in words is "eighty-one million, nine hundred twenty-seven thousand, eight hundred eighty-seven".