409561379 has 2 divisors, whose sum is σ = 409561380. Its totient is φ = 409561378.

The previous prime is 409561351. The next prime is 409561387. The reversal of 409561379 is 973165904.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 409561379 - 2⁸ = 409561123 is a prime.

It is not a weakly prime, because it can be changed into another prime (409561319) 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 as a sum of consecutive naturals, namely, 204780689 + 204780690.

It is an arithmetic number, because the mean of its divisors is an integer number (204780690).

Almost surely, 2^409561379 is an apocalyptic number.

409561379 is a deficient number, since it is larger than the sum of its proper divisors (1).

409561379 is an equidigital number, since it uses as much as digits as its factorization.

409561379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 44.

The square root of 409561379 is about 20237.6228594171. The cubic root of 409561379 is about 742.6308711337.

The spelling of 409561379 in words is "four hundred nine million, five hundred sixty-one thousand, three hundred seventy-nine".