800129581 has 4 divisors (see below), whose sum is σ = 800864064. Its totient is φ = 799395100.

The previous prime is 800129573. The next prime is 800129593. The reversal of 800129581 is 185921008.

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 800129581 - 2³ = 800129573 is a prime.

It is a super-2 number, since 2×800129581² = 1280414692782471122, which 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 (800124581) 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, 365605 + ... + 367786.

It is an arithmetic number, because the mean of its divisors is an integer number (200216016).

Almost surely, 2^800129581 is an apocalyptic number.

It is an amenable number.

800129581 is a deficient number, since it is larger than the sum of its proper divisors (734483).

800129581 is a wasteful number, since it uses less digits than its factorization.

800129581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734482.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 800129581 is about 28286.5618448054. The cubic root of 800129581 is about 928.3678858268.

The spelling of 800129581 in words is "eight hundred million, one hundred twenty-nine thousand, five hundred eighty-one".