804142081 has 4 divisors (see below), whose sum is σ = 809075632. Its totient is φ = 799208532.

The previous prime is 804142063. The next prime is 804142099. The reversal of 804142081 is 180241408.

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.

It is an interprime number because it is at equal distance from previous prime (804142063) and next prime (804142099).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-804142081 is a prime.

It is a super-2 number, since 2×804142081² = 1293288972870021122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (804142051) 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, 2466531 + ... + 2466856.

It is an arithmetic number, because the mean of its divisors is an integer number (202268908).

Almost surely, 2^804142081 is an apocalyptic number.

It is an amenable number.

804142081 is a deficient number, since it is larger than the sum of its proper divisors (4933551).

804142081 is a wasteful number, since it uses less digits than its factorization.

804142081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4933550.

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 804142081 is about 28357.3990520993. The cubic root of 804142081 is about 929.9171626221.

Adding to 804142081 its reverse (180241408), we get a palindrome (984383489).

The spelling of 804142081 in words is "eight hundred four million, one hundred forty-two thousand, eighty-one".