81087887 has 2 divisors, whose sum is σ = 81087888. Its totient is φ = 81087886.

The previous prime is 81087859. The next prime is 81087899. The reversal of 81087887 is 78878018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81087887 - 2⁸ = 81087631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81087817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40543943 + 40543944.

It is an arithmetic number, because the mean of its divisors is an integer number (40543944).

Almost surely, 2^81087887 is an apocalyptic number.

81087887 is a deficient number, since it is larger than the sum of its proper divisors (1).

81087887 is an equidigital number, since it uses as much as digits as its factorization.

81087887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 200704, while the sum is 47.

The square root of 81087887 is about 9004.8812873907. The cubic root of 81087887 is about 432.8313021682.

The spelling of 81087887 in words is "eighty-one million, eighty-seven thousand, eight hundred eighty-seven".