81919114 has 8 divisors (see below), whose sum is σ = 122977728. Its totient is φ = 40926540.

The previous prime is 81919069. The next prime is 81919139. The reversal of 81919114 is 41191918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 81919114.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13282 + ... + 18445.

It is an arithmetic number, because the mean of its divisors is an integer number (15372216).

Almost surely, 2^81919114 is an apocalyptic number.

81919114 is a deficient number, since it is larger than the sum of its proper divisors (41058614).

81919114 is a wasteful number, since it uses less digits than its factorization.

81919114 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33020.

The product of its digits is 2592, while the sum is 34.

The square root of 81919114 is about 9050.9178540080. The cubic root of 81919114 is about 434.3052529113.

The spelling of 81919114 in words is "eighty-one million, nine hundred nineteen thousand, one hundred fourteen".