81051875 has 20 divisors (see below), whose sum is σ = 103785528. Its totient is φ = 63240000.

The previous prime is 81051871. The next prime is 81051877. The reversal of 81051875 is 57815018.

It is not a de Polignac number, because 81051875 - 2² = 81051871 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81051871) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 24044 + ... + 27206.

Almost surely, 2^81051875 is an apocalyptic number.

81051875 is a deficient number, since it is larger than the sum of its proper divisors (22733653).

81051875 is an equidigital number, since it uses as much as digits as its factorization.

81051875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3224 (or 3209 counting only the distinct ones).

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

The square root of 81051875 is about 9002.8814831697. The cubic root of 81051875 is about 432.7672176730.

The spelling of 81051875 in words is "eighty-one million, fifty-one thousand, eight hundred seventy-five".