81299795 has 4 divisors (see below), whose sum is σ = 97559760. Its totient is φ = 65039832.

The previous prime is 81299791. The next prime is 81299807. The reversal of 81299795 is 59799218.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81299795 - 2² = 81299791 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81299791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8129975 + ... + 8129984.

It is an arithmetic number, because the mean of its divisors is an integer number (24389940).

Almost surely, 2^81299795 is an apocalyptic number.

81299795 is a deficient number, since it is larger than the sum of its proper divisors (16259965).

81299795 is a wasteful number, since it uses less digits than its factorization.

81299795 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16259964.

The product of its digits is 408240, while the sum is 50.

The square root of 81299795 is about 9016.6398952160. The cubic root of 81299795 is about 433.2080153729.

The spelling of 81299795 in words is "eighty-one million, two hundred ninety-nine thousand, seven hundred ninety-five".