531878449 has 2 divisors, whose sum is σ = 531878450. Its totient is φ = 531878448.

The previous prime is 531878447. The next prime is 531878453. The reversal of 531878449 is 944878135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 430272049 + 101606400 = 20743^2 + 10080^2 .

It is a cyclic number.

It is not a de Polignac number, because 531878449 - 2¹ = 531878447 is a prime.

Together with 531878447, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (531878447) 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, 265939224 + 265939225.

It is an arithmetic number, because the mean of its divisors is an integer number (265939225).

Almost surely, 2^531878449 is an apocalyptic number.

It is an amenable number.

531878449 is a deficient number, since it is larger than the sum of its proper divisors (1).

531878449 is an equidigital number, since it uses as much as digits as its factorization.

531878449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 49.

The square root of 531878449 is about 23062.4900867187. The cubic root of 531878449 is about 810.2221861647. Note that the first 3 decimals are identical.

The spelling of 531878449 in words is "five hundred thirty-one million, eight hundred seventy-eight thousand, four hundred forty-nine".