81031294 has 8 divisors (see below), whose sum is σ = 121589208. Its totient is φ = 40501560.

The previous prime is 81031289. The next prime is 81031309. The reversal of 81031294 is 49213018.

It is a happy number.

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

It is a congruent number.

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, 3024 + ... + 13084.

It is an arithmetic number, because the mean of its divisors is an integer number (15198651).

Almost surely, 2^81031294 is an apocalyptic number.

81031294 is a deficient number, since it is larger than the sum of its proper divisors (40557914).

81031294 is a wasteful number, since it uses less digits than its factorization.

81031294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14090.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 81031294 is about 9001.7383876671. The cubic root of 81031294 is about 432.7305846069.

The spelling of 81031294 in words is "eighty-one million, thirty-one thousand, two hundred ninety-four".