900800138591 has 4 divisors (see below), whose sum is σ = 939965362032. Its totient is φ = 861634915152.

The previous prime is 900800138573. The next prime is 900800138603. The reversal of 900800138591 is 195831008009.

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 900800138591 - 2²² = 900795944287 is a prime.

It is a super-2 number, since 2×900800138591² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (900800138501) 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, 19582611686 + ... + 19582611731.

It is an arithmetic number, because the mean of its divisors is an integer number (234991340508).

Almost surely, 2^900800138591 is an apocalyptic number.

900800138591 is a deficient number, since it is larger than the sum of its proper divisors (39165223441).

900800138591 is a wasteful number, since it uses less digits than its factorization.

900800138591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39165223440.

The product of its (nonzero) digits is 77760, while the sum is 44.

The spelling of 900800138591 in words is "nine hundred billion, eight hundred million, one hundred thirty-eight thousand, five hundred ninety-one".