81831058 has 8 divisors (see below), whose sum is σ = 122992128. Its totient is φ = 40833684.

The previous prime is 81831017. The next prime is 81831067. The reversal of 81831058 is 85013818.

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

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, 39666 + ... + 41677.

It is an arithmetic number, because the mean of its divisors is an integer number (15374016).

Almost surely, 2^81831058 is an apocalyptic number.

81831058 is a deficient number, since it is larger than the sum of its proper divisors (41161070).

81831058 is a wasteful number, since it uses less digits than its factorization.

81831058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81848.

The product of its (nonzero) digits is 7680, while the sum is 34.

The square root of 81831058 is about 9046.0520670622. The cubic root of 81831058 is about 434.1495835264.

The spelling of 81831058 in words is "eighty-one million, eight hundred thirty-one thousand, fifty-eight".