531456421 has 2 divisors, whose sum is σ = 531456422. Its totient is φ = 531456420.

The previous prime is 531456347. The next prime is 531456433. The reversal of 531456421 is 124654135.

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., 295496100 + 235960321 = 17190^2 + 15361^2 .

It is a cyclic number.

It is not a de Polignac number, because 531456421 - 2²⁷ = 397238693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531456521) 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, 265728210 + 265728211.

It is an arithmetic number, because the mean of its divisors is an integer number (265728211).

Almost surely, 2^531456421 is an apocalyptic number.

It is an amenable number.

531456421 is a deficient number, since it is larger than the sum of its proper divisors (1).

531456421 is an equidigital number, since it uses as much as digits as its factorization.

531456421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 31.

The square root of 531456421 is about 23053.3386085400. The cubic root of 531456421 is about 810.0078346039.

The spelling of 531456421 in words is "five hundred thirty-one million, four hundred fifty-six thousand, four hundred twenty-one".