81295975 has 6 divisors (see below), whose sum is σ = 100807040. Its totient is φ = 65036760.

The previous prime is 81295931. The next prime is 81295997. The reversal of 81295975 is 57959218.

It is not a de Polignac number, because 81295975 - 2⁷ = 81295847 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1625895 + ... + 1625944.

Almost surely, 2^81295975 is an apocalyptic number.

81295975 is a deficient number, since it is larger than the sum of its proper divisors (19511065).

81295975 is a wasteful number, since it uses less digits than its factorization.

81295975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3251849 (or 3251844 counting only the distinct ones).

The product of its digits is 226800, while the sum is 46.

The square root of 81295975 is about 9016.4280621541. The cubic root of 81295975 is about 433.2012302777.

The spelling of 81295975 in words is "eighty-one million, two hundred ninety-five thousand, nine hundred seventy-five".