409368991 has 2 divisors, whose sum is σ = 409368992. Its totient is φ = 409368990.

The previous prime is 409368983. The next prime is 409369001. The reversal of 409368991 is 199863904.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 409368991 - 2³ = 409368983 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (409362991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204684495 + 204684496.

It is an arithmetic number, because the mean of its divisors is an integer number (204684496).

Almost surely, 2^409368991 is an apocalyptic number.

409368991 is a deficient number, since it is larger than the sum of its proper divisors (1).

409368991 is an equidigital number, since it uses as much as digits as its factorization.

409368991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 409368991 is about 20232.8690748495. The cubic root of 409368991 is about 742.5145713942.

The spelling of 409368991 in words is "four hundred nine million, three hundred sixty-eight thousand, nine hundred ninety-one".