531013421 has 2 divisors, whose sum is σ = 531013422. Its totient is φ = 531013420.

The previous prime is 531013409. The next prime is 531013451. The reversal of 531013421 is 124310135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 480048100 + 50965321 = 21910^2 + 7139^2 .

It is a cyclic number.

It is not a de Polignac number, because 531013421 - 2¹⁴ = 530997037 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 531013393 and 531013402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531013451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265506710 + 265506711.

It is an arithmetic number, because the mean of its divisors is an integer number (265506711).

Almost surely, 2^531013421 is an apocalyptic number.

It is an amenable number.

531013421 is a deficient number, since it is larger than the sum of its proper divisors (1).

531013421 is an equidigital number, since it uses as much as digits as its factorization.

531013421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 531013421 is about 23043.7284526615. The cubic root of 531013421 is about 809.7827090774.

Adding to 531013421 its reverse (124310135), we get a palindrome (655323556).

The spelling of 531013421 in words is "five hundred thirty-one million, thirteen thousand, four hundred twenty-one".