409495091 has 4 divisors (see below), whose sum is σ = 409689384. Its totient is φ = 409300800.

The previous prime is 409495069. The next prime is 409495129. The reversal of 409495091 is 190594904.

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 409495091 - 2¹⁰ = 409494067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (409495001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93950 + ... + 98211.

It is an arithmetic number, because the mean of its divisors is an integer number (102422346).

Almost surely, 2^409495091 is an apocalyptic number.

409495091 is a deficient number, since it is larger than the sum of its proper divisors (194293).

409495091 is a wasteful number, since it uses less digits than its factorization.

409495091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194292.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 409495091 is about 20235.9850513880. The cubic root of 409495091 is about 742.5908037398.

The spelling of 409495091 in words is "four hundred nine million, four hundred ninety-five thousand, ninety-one".