531449021 has 2 divisors, whose sum is σ = 531449022. Its totient is φ = 531449020.

The previous prime is 531449003. The next prime is 531449029. The reversal of 531449021 is 120944135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 531072025 + 376996 = 23045^2 + 614^2 .

It is a cyclic number.

It is not a de Polignac number, because 531449021 - 2¹⁴ = 531432637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531449029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265724510 + 265724511.

It is an arithmetic number, because the mean of its divisors is an integer number (265724511).

Almost surely, 2^531449021 is an apocalyptic number.

It is an amenable number.

531449021 is a deficient number, since it is larger than the sum of its proper divisors (1).

531449021 is an equidigital number, since it uses as much as digits as its factorization.

531449021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 531449021 is about 23053.1781106207. The cubic root of 531449021 is about 810.0040750697.

The spelling of 531449021 in words is "five hundred thirty-one million, four hundred forty-nine thousand, twenty-one".