81941836 has 12 divisors (see below), whose sum is σ = 151833528. Its totient is φ = 38560832.

The previous prime is 81941831. The next prime is 81941861. The reversal of 81941836 is 63814918.

It is not an unprimeable number, because it can be changed into a prime (81941831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 602446 + ... + 602581.

It is an arithmetic number, because the mean of its divisors is an integer number (12652794).

Almost surely, 2^81941836 is an apocalyptic number.

It is an amenable number.

81941836 is a deficient number, since it is larger than the sum of its proper divisors (69891692).

81941836 is a wasteful number, since it uses less digits than its factorization.

81941836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1205048 (or 1205046 counting only the distinct ones).

The product of its digits is 41472, while the sum is 40.

The square root of 81941836 is about 9052.1729987887. The cubic root of 81941836 is about 434.3454037838.

The spelling of 81941836 in words is "eighty-one million, nine hundred forty-one thousand, eight hundred thirty-six".