16431449 has 2 divisors, whose sum is σ = 16431450. Its totient is φ = 16431448.

The previous prime is 16431421. The next prime is 16431473. The reversal of 16431449 is 94413461.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13741849 + 2689600 = 3707^2 + 1640^2 .

It is a cyclic number.

It is not a de Polignac number, because 16431449 - 2⁸ = 16431193 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16431419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8215724 + 8215725.

It is an arithmetic number, because the mean of its divisors is an integer number (8215725).

Almost surely, 2^16431449 is an apocalyptic number.

It is an amenable number.

16431449 is a deficient number, since it is larger than the sum of its proper divisors (1).

16431449 is an equidigital number, since it uses as much as digits as its factorization.

16431449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

The square root of 16431449 is about 4053.5723750786. The cubic root of 16431449 is about 254.2291162262.

It can be divided in two parts, 164 and 31449, that added together give a palindrome (31613).

The spelling of 16431449 in words is "sixteen million, four hundred thirty-one thousand, four hundred forty-nine".