819045881 has 4 divisors (see below), whose sum is σ = 822309264. Its totient is φ = 815782500.

The previous prime is 819045859. The next prime is 819045919. The reversal of 819045881 is 188540918.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 188540918 = 2 ⋅94270459.

It is a cyclic number.

It is not a de Polignac number, because 819045881 - 2²² = 814851577 is a prime.

It is a super-2 number, since 2×819045881² = 1341672310366132322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (819045481) 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, 1631315 + ... + 1631816.

It is an arithmetic number, because the mean of its divisors is an integer number (205577316).

Almost surely, 2^819045881 is an apocalyptic number.

It is an amenable number.

819045881 is a deficient number, since it is larger than the sum of its proper divisors (3263383).

819045881 is a wasteful number, since it uses less digits than its factorization.

819045881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3263382.

The product of its (nonzero) digits is 92160, while the sum is 44.

The square root of 819045881 is about 28618.9776372253. The cubic root of 819045881 is about 935.6269945936.

The spelling of 819045881 in words is "eight hundred nineteen million, forty-five thousand, eight hundred eighty-one".