81875351 has 8 divisors (see below), whose sum is σ = 86766000. Its totient is φ = 77042880.

The previous prime is 81875341. The next prime is 81875357. The reversal of 81875351 is 15357818.

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

It is a cyclic number.

It is not a de Polignac number, because 81875351 - 2¹⁰ = 81874327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81875357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11630 + ... + 17291.

It is an arithmetic number, because the mean of its divisors is an integer number (10845750).

Almost surely, 2^81875351 is an apocalyptic number.

81875351 is a deficient number, since it is larger than the sum of its proper divisors (4890649).

81875351 is a wasteful number, since it uses less digits than its factorization.

81875351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29089.

The product of its digits is 33600, while the sum is 38.

The square root of 81875351 is about 9048.4999309278. The cubic root of 81875351 is about 434.2279006491.

The spelling of 81875351 in words is "eighty-one million, eight hundred seventy-five thousand, three hundred fifty-one".