801990591 has 4 divisors (see below), whose sum is σ = 1069320792. Its totient is φ = 534660392.

The previous prime is 801990583. The next prime is 801990617. The reversal of 801990591 is 195099108.

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 801990591 - 2³ = 801990583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (801990991) 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, 133665096 + ... + 133665101.

It is an arithmetic number, because the mean of its divisors is an integer number (267330198).

Almost surely, 2^801990591 is an apocalyptic number.

801990591 is a deficient number, since it is larger than the sum of its proper divisors (267330201).

801990591 is a wasteful number, since it uses less digits than its factorization.

801990591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267330200.

The product of its (nonzero) digits is 29160, while the sum is 42.

The square root of 801990591 is about 28319.4383948552. The cubic root of 801990591 is about 929.0870877366.

The spelling of 801990591 in words is "eight hundred one million, nine hundred ninety thousand, five hundred ninety-one".