81948273 has 16 divisors (see below), whose sum is σ = 125472000. Its totient is φ = 47051280.

The previous prime is 81948247. The next prime is 81948277. The reversal of 81948273 is 37284918.

It is a de Polignac number, because none of the positive numbers 2^k-81948273 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81948277) 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, 64723 + ... + 65976.

It is an arithmetic number, because the mean of its divisors is an integer number (7842000).

Almost surely, 2^81948273 is an apocalyptic number.

It is an amenable number.

81948273 is a deficient number, since it is larger than the sum of its proper divisors (43523727).

81948273 is a wasteful number, since it uses less digits than its factorization.

81948273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130732.

The product of its digits is 96768, while the sum is 42.

The square root of 81948273 is about 9052.5285417943. The cubic root of 81948273 is about 434.3567769247.

The spelling of 81948273 in words is "eighty-one million, nine hundred forty-eight thousand, two hundred seventy-three".