81227995 has 4 divisors (see below), whose sum is σ = 97473600. Its totient is φ = 64982392.

The previous prime is 81227947. The next prime is 81228031. The reversal of 81227995 is 59972218.

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 81227995 - 2¹⁷ = 81096923 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8122795 + ... + 8122804.

It is an arithmetic number, because the mean of its divisors is an integer number (24368400).

Almost surely, 2^81227995 is an apocalyptic number.

81227995 is a deficient number, since it is larger than the sum of its proper divisors (16245605).

81227995 is a wasteful number, since it uses less digits than its factorization.

81227995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16245604.

The product of its digits is 90720, while the sum is 43.

The square root of 81227995 is about 9012.6574882218. The cubic root of 81227995 is about 433.0804484395.

The spelling of 81227995 in words is "eighty-one million, two hundred twenty-seven thousand, nine hundred ninety-five".