531213325 has 6 divisors (see below), whose sum is σ = 658704554. Its totient is φ = 424970640.

The previous prime is 531213307. The next prime is 531213337. The reversal of 531213325 is 523312135.

It can be written as a sum of positive squares in 3 ways, for example, as 155900196 + 375313129 = 12486^2 + 19373^2 .

It is not a de Polignac number, because 531213325 - 2¹¹ = 531211277 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 21248533 = 531213325 / (5 + 3 + 1 + 2 + 1 + 3 + 3 + 2 + 5).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 531213325.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10624242 + ... + 10624291.

Almost surely, 2^531213325 is an apocalyptic number.

It is an amenable number.

531213325 is a deficient number, since it is larger than the sum of its proper divisors (127491229).

531213325 is a wasteful number, since it uses less digits than its factorization.

531213325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21248543 (or 21248538 counting only the distinct ones).

The product of its digits is 2700, while the sum is 25.

The square root of 531213325 is about 23048.0655370467. The cubic root of 531213325 is about 809.8843125943.

The spelling of 531213325 in words is "five hundred thirty-one million, two hundred thirteen thousand, three hundred twenty-five".