81750887 has 2 divisors, whose sum is σ = 81750888. Its totient is φ = 81750886.

The previous prime is 81750883. The next prime is 81750899. The reversal of 81750887 is 78805718.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81750887 - 2² = 81750883 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81750881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40875443 + 40875444.

It is an arithmetic number, because the mean of its divisors is an integer number (40875444).

Almost surely, 2^81750887 is an apocalyptic number.

81750887 is a deficient number, since it is larger than the sum of its proper divisors (1).

81750887 is an equidigital number, since it uses as much as digits as its factorization.

81750887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 125440, while the sum is 44.

The square root of 81750887 is about 9041.6197110916. The cubic root of 81750887 is about 434.0077564500.

The spelling of 81750887 in words is "eighty-one million, seven hundred fifty thousand, eight hundred eighty-seven".