409581813 has 4 divisors (see below), whose sum is σ = 546109088. Its totient is φ = 273054540.

The previous prime is 409581793. The next prime is 409581839. The reversal of 409581813 is 318185904.

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 not a de Polignac number, because 409581813 - 2¹⁰ = 409580789 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 (409581853) 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, 68263633 + ... + 68263638.

It is an arithmetic number, because the mean of its divisors is an integer number (136527272).

Almost surely, 2^409581813 is an apocalyptic number.

It is an amenable number.

409581813 is a deficient number, since it is larger than the sum of its proper divisors (136527275).

409581813 is a wasteful number, since it uses less digits than its factorization.

409581813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136527274.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 409581813 is about 20238.1277049039. The cubic root of 409581813 is about 742.6432214737.

The spelling of 409581813 in words is "four hundred nine million, five hundred eighty-one thousand, eight hundred thirteen".