801331861 has 4 divisors (see below), whose sum is σ = 874180224. Its totient is φ = 728483500.

The previous prime is 801331849. The next prime is 801331889. The reversal of 801331861 is 168133108.

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 a cyclic number.

It is not a de Polignac number, because 801331861 - 2⁷ = 801331733 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 (801371861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36424165 + ... + 36424186.

It is an arithmetic number, because the mean of its divisors is an integer number (218545056).

Almost surely, 2^801331861 is an apocalyptic number.

It is an amenable number.

801331861 is a deficient number, since it is larger than the sum of its proper divisors (72848363).

801331861 is a wasteful number, since it uses less digits than its factorization.

801331861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72848362.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 801331861 is about 28307.8056549779. The cubic root of 801331861 is about 928.8326436967.

Adding to 801331861 its reverse (168133108), we get a palindrome (969464969).

The spelling of 801331861 in words is "eight hundred one million, three hundred thirty-one thousand, eight hundred sixty-one".