819972271 has 4 divisors (see below), whose sum is σ = 868205952. Its totient is φ = 771738592.

The previous prime is 819972253. The next prime is 819972299. The reversal of 819972271 is 172279918.

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 819972271 - 2⁵ = 819972239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819972211) 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, 24116815 + ... + 24116848.

It is an arithmetic number, because the mean of its divisors is an integer number (217051488).

Almost surely, 2^819972271 is an apocalyptic number.

819972271 is a deficient number, since it is larger than the sum of its proper divisors (48233681).

819972271 is a wasteful number, since it uses less digits than its factorization.

819972271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48233680.

The product of its digits is 127008, while the sum is 46.

The square root of 819972271 is about 28635.1579531177. The cubic root of 819972271 is about 935.9796117597.

The spelling of 819972271 in words is "eight hundred nineteen million, nine hundred seventy-two thousand, two hundred seventy-one".