81030494 has 4 divisors (see below), whose sum is σ = 121545744. Its totient is φ = 40515246.

The previous prime is 81030487. The next prime is 81030503. The reversal of 81030494 is 49403018.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20257622 + ... + 20257625.

It is an arithmetic number, because the mean of its divisors is an integer number (30386436).

Almost surely, 2^81030494 is an apocalyptic number.

81030494 is a deficient number, since it is larger than the sum of its proper divisors (40515250).

81030494 is a wasteful number, since it uses less digits than its factorization.

81030494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40515249.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 81030494 is about 9001.6939516960. The cubic root of 81030494 is about 432.7291605250.

The spelling of 81030494 in words is "eighty-one million, thirty thousand, four hundred ninety-four".