81948494 has 16 divisors (see below), whose sum is σ = 130691232. Its totient is φ = 38452128.

The previous prime is 81948487. The next prime is 81948509. The reversal of 81948494 is 49484918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14369 + ... + 19244.

It is an arithmetic number, because the mean of its divisors is an integer number (8168202).

Almost surely, 2^81948494 is an apocalyptic number.

81948494 is a deficient number, since it is larger than the sum of its proper divisors (48742738).

81948494 is a wasteful number, since it uses less digits than its factorization.

81948494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33691.

The product of its digits is 331776, while the sum is 47.

The square root of 81948494 is about 9052.5407483203. The cubic root of 81948494 is about 434.3571673855.

The spelling of 81948494 in words is "eighty-one million, nine hundred forty-eight thousand, four hundred ninety-four".