81948339 has 24 divisors (see below), whose sum is σ = 130216944. Its totient is φ = 49658400.

The previous prime is 81948323. The next prime is 81948353. The reversal of 81948339 is 93384918.

It is not a de Polignac number, because 81948339 - 2⁴ = 81948323 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81948294 and 81948303.

It is not an unprimeable number, because it can be changed into a prime (81948319) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8559 + ... + 15399.

It is an arithmetic number, because the mean of its divisors is an integer number (5425706).

Almost surely, 2^81948339 is an apocalyptic number.

81948339 is a deficient number, since it is larger than the sum of its proper divisors (48268605).

81948339 is a wasteful number, since it uses less digits than its factorization.

81948339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6880 (or 6855 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 81948339 is about 9052.5321871839. The cubic root of 81948339 is about 434.3568935330.

The spelling of 81948339 in words is "eighty-one million, nine hundred forty-eight thousand, three hundred thirty-nine".