81098215 has 32 divisors (see below), whose sum is σ = 110854656. Its totient is φ = 56434560.

The previous prime is 81098153. The next prime is 81098231. The reversal of 81098215 is 51289018.

It is not a de Polignac number, because 81098215 - 2⁹ = 81097703 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 125022 + ... + 125668.

It is an arithmetic number, because the mean of its divisors is an integer number (3464208).

Almost surely, 2^81098215 is an apocalyptic number.

81098215 is a deficient number, since it is larger than the sum of its proper divisors (29756441).

81098215 is a wasteful number, since it uses less digits than its factorization.

81098215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 81098215 is about 9005.4547358809. The cubic root of 81098215 is about 432.8496776702.

The spelling of 81098215 in words is "eighty-one million, ninety-eight thousand, two hundred fifteen".