801371999 has 4 divisors (see below), whose sum is σ = 809633664. Its totient is φ = 793110336.

The previous prime is 801371969. The next prime is 801372007. The reversal of 801371999 is 999173108.

It is a happy number.

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 801371999 - 2⁸ = 801371743 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 (801371929) 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, 4130687 + ... + 4130880.

It is an arithmetic number, because the mean of its divisors is an integer number (202408416).

Almost surely, 2^801371999 is an apocalyptic number.

801371999 is a deficient number, since it is larger than the sum of its proper divisors (8261665).

801371999 is an equidigital number, since it uses as much as digits as its factorization.

801371999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8261664.

The product of its (nonzero) digits is 122472, while the sum is 47.

The square root of 801371999 is about 28308.5146025008. The cubic root of 801371999 is about 928.8481515714.

The spelling of 801371999 in words is "eight hundred one million, three hundred seventy-one thousand, nine hundred ninety-nine".