81087093 has 12 divisors (see below), whose sum is σ = 124015788. Its totient is φ = 50878080.

The previous prime is 81087077. The next prime is 81087107. The reversal of 81087093 is 39078018.

It can be written as a sum of positive squares in 2 ways, for example, as 72284004 + 8803089 = 8502^2 + 2967^2 .

It is not a de Polignac number, because 81087093 - 2⁴ = 81087077 is a prime.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81017093) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 264838 + ... + 265143.

It is an arithmetic number, because the mean of its divisors is an integer number (10334649).

Almost surely, 2^81087093 is an apocalyptic number.

It is an amenable number.

81087093 is a deficient number, since it is larger than the sum of its proper divisors (42928695).

81087093 is a wasteful number, since it uses less digits than its factorization.

81087093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530004 (or 530001 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 81087093 is about 9004.8372000831. The cubic root of 81087093 is about 432.8298894246.

The spelling of 81087093 in words is "eighty-one million, eighty-seven thousand, ninety-three".