81057851 has 8 divisors (see below), whose sum is σ = 92932320. Its totient is φ = 69257088.

The previous prime is 81057833. The next prime is 81057859. The reversal of 81057851 is 15875018.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81057851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81057859) 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, 16046 + ... + 20483.

It is an arithmetic number, because the mean of its divisors is an integer number (11616540).

Almost surely, 2^81057851 is an apocalyptic number.

81057851 is a deficient number, since it is larger than the sum of its proper divisors (11874469).

81057851 is a wasteful number, since it uses less digits than its factorization.

81057851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36853.

The product of its (nonzero) digits is 11200, while the sum is 35.

The square root of 81057851 is about 9003.2133707916. The cubic root of 81057851 is about 432.7778534679. Note that the first 3 decimals are identical.

The spelling of 81057851 in words is "eighty-one million, fifty-seven thousand, eight hundred fifty-one".