409381861 has 4 divisors (see below), whose sum is σ = 467864992. Its totient is φ = 350898732.

The previous prime is 409381829. The next prime is 409381867. The reversal of 409381861 is 168183904.

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 409381861 - 2⁵ = 409381829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409381867) 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, 29241555 + ... + 29241568.

It is an arithmetic number, because the mean of its divisors is an integer number (116966248).

Almost surely, 2^409381861 is an apocalyptic number.

It is an amenable number.

409381861 is a deficient number, since it is larger than the sum of its proper divisors (58483131).

409381861 is an equidigital number, since it uses as much as digits as its factorization.

409381861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58483130.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 409381861 is about 20233.1871191861. The cubic root of 409381861 is about 742.5223525261.

The spelling of 409381861 in words is "four hundred nine million, three hundred eighty-one thousand, eight hundred sixty-one".