409949851 has 2 divisors, whose sum is σ = 409949852. Its totient is φ = 409949850.

The previous prime is 409949821. The next prime is 409949929. The reversal of 409949851 is 158949904.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 409949851 - 2⁵ = 409949819 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 409949795 and 409949804.

It is not a weakly prime, because it can be changed into another prime (409949801) 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, 204974925 + 204974926.

It is an arithmetic number, because the mean of its divisors is an integer number (204974926).

Almost surely, 2^409949851 is an apocalyptic number.

409949851 is a deficient number, since it is larger than the sum of its proper divisors (1).

409949851 is an equidigital number, since it uses as much as digits as its factorization.

409949851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 409949851 is about 20247.2183521589. The cubic root of 409949851 is about 742.8655938969.

The spelling of 409949851 in words is "four hundred nine million, nine hundred forty-nine thousand, eight hundred fifty-one".