81896241 has 16 divisors (see below), whose sum is σ = 125210624. Its totient is φ = 46641744.

The previous prime is 81896239. The next prime is 81896263. The reversal of 81896241 is 14269818.

It is not a de Polignac number, because 81896241 - 2¹ = 81896239 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81896241.

It is not an unprimeable number, because it can be changed into a prime (81896341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96 + ... + 12798.

It is an arithmetic number, because the mean of its divisors is an integer number (7825664).

Almost surely, 2^81896241 is an apocalyptic number.

It is an amenable number.

81896241 is a deficient number, since it is larger than the sum of its proper divisors (43314383).

81896241 is a wasteful number, since it uses less digits than its factorization.

81896241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13020.

The product of its digits is 27648, while the sum is 39.

The square root of 81896241 is about 9049.6541922882. The cubic root of 81896241 is about 434.2648277151.

The spelling of 81896241 in words is "eighty-one million, eight hundred ninety-six thousand, two hundred forty-one".