81375195 has 64 divisors (see below), whose sum is σ = 151580160. Its totient is φ = 36864000.

The previous prime is 81375191. The next prime is 81375199. The reversal of 81375195 is 59157318.

It is an interprime number because it is at equal distance from previous prime (81375191) and next prime (81375199).

It is not a de Polignac number, because 81375195 - 2² = 81375191 is a prime.

It is a super-2 number, since 2×81375195² = 13243844722576050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81375191) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 316507 + ... + 316763.

It is an arithmetic number, because the mean of its divisors is an integer number (2368440).

Almost surely, 2^81375195 is an apocalyptic number.

81375195 is a deficient number, since it is larger than the sum of its proper divisors (70204965).

81375195 is a wasteful number, since it uses less digits than its factorization.

81375195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396.

The product of its digits is 37800, while the sum is 39.

The square root of 81375195 is about 9020.8200846708. The cubic root of 81375195 is about 433.3418975954.

The spelling of 81375195 in words is "eighty-one million, three hundred seventy-five thousand, one hundred ninety-five".