409561387 has 2 divisors, whose sum is σ = 409561388. Its totient is φ = 409561386.

The previous prime is 409561379. The next prime is 409561393. The reversal of 409561387 is 783165904.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 409561387 - 2³ = 409561379 is a prime.

It is not a weakly prime, because it can be changed into another prime (409564387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204780693 + 204780694.

It is an arithmetic number, because the mean of its divisors is an integer number (204780694).

Almost surely, 2^409561387 is an apocalyptic number.

409561387 is a deficient number, since it is larger than the sum of its proper divisors (1).

409561387 is an equidigital number, since it uses as much as digits as its factorization.

409561387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 409561387 is about 20237.6230570687. The cubic root of 409561387 is about 742.6308759690.

The spelling of 409561387 in words is "four hundred nine million, five hundred sixty-one thousand, three hundred eighty-seven".