81913852 has 6 divisors (see below), whose sum is σ = 143349248. Its totient is φ = 40956924.

The previous prime is 81913847. The next prime is 81913901. The reversal of 81913852 is 25831918.

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 as a sum of consecutive naturals, namely, 10239228 + ... + 10239235.

Almost surely, 2^81913852 is an apocalyptic number.

It is an amenable number.

81913852 is a deficient number, since it is larger than the sum of its proper divisors (61435396).

81913852 is a wasteful number, since it uses less digits than its factorization.

81913852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20478467 (or 20478465 counting only the distinct ones).

The product of its digits is 17280, while the sum is 37.

The square root of 81913852 is about 9050.6271605895. The cubic root of 81913852 is about 434.2959536441.

The spelling of 81913852 in words is "eighty-one million, nine hundred thirteen thousand, eight hundred fifty-two".