81949935 has 8 divisors (see below), whose sum is σ = 131119920. Its totient is φ = 43706624.

The previous prime is 81949919. The next prime is 81949937. The reversal of 81949935 is 53994918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81949935 - 2⁴ = 81949919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81949937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2731650 + ... + 2731679.

It is an arithmetic number, because the mean of its divisors is an integer number (16389990).

Almost surely, 2^81949935 is an apocalyptic number.

81949935 is a deficient number, since it is larger than the sum of its proper divisors (49169985).

81949935 is a wasteful number, since it uses less digits than its factorization.

81949935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5463337.

The product of its digits is 349920, while the sum is 48.

The square root of 81949935 is about 9052.6203388853. The cubic root of 81949935 is about 434.3597133140.

The spelling of 81949935 in words is "eighty-one million, nine hundred forty-nine thousand, nine hundred thirty-five".