409121791 has 6 divisors (see below), whose sum is σ = 443013720. Its totient is φ = 377650728.

The previous prime is 409121771. The next prime is 409121819. The reversal of 409121791 is 197121904.

It is not a de Polignac number, because 409121791 - 2¹³ = 409113599 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 (409121701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1210251 + ... + 1210588.

It is an arithmetic number, because the mean of its divisors is an integer number (73835620).

Almost surely, 2^409121791 is an apocalyptic number.

409121791 is a deficient number, since it is larger than the sum of its proper divisors (33891929).

409121791 is a wasteful number, since it uses less digits than its factorization.

409121791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2420865 (or 2420852 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 409121791 is about 20226.7592807152. The cubic root of 409121791 is about 742.3650839600.

The spelling of 409121791 in words is "four hundred nine million, one hundred twenty-one thousand, seven hundred ninety-one".