81293414 has 16 divisors (see below), whose sum is σ = 124746480. Its totient is φ = 39717600.

The previous prime is 81293413. The next prime is 81293441. The reversal of 81293414 is 41439218.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81293413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27089 + ... + 29939.

It is an arithmetic number, because the mean of its divisors is an integer number (7796655).

Almost surely, 2^81293414 is an apocalyptic number.

81293414 is a deficient number, since it is larger than the sum of its proper divisors (43453066).

81293414 is a wasteful number, since it uses less digits than its factorization.

81293414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3175.

The product of its digits is 6912, while the sum is 32.

The square root of 81293414 is about 9016.2860424900. The cubic root of 81293414 is about 433.1966813030.

The spelling of 81293414 in words is "eighty-one million, two hundred ninety-three thousand, four hundred fourteen".