531245121 has 16 divisors (see below), whose sum is σ = 818175168. Its totient is φ = 303027200.

The previous prime is 531245119. The next prime is 531245123. The reversal of 531245121 is 121542135.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (531245119) and next prime (531245123).

It is a cyclic number.

It is not a de Polignac number, because 531245121 - 2¹ = 531245119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 531245091 and 531245100.

It is not an unprimeable number, because it can be changed into a prime (531245123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 472920 + ... + 474041.

It is an arithmetic number, because the mean of its divisors is an integer number (51135948).

Almost surely, 2^531245121 is an apocalyptic number.

531245121 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

531245121 is a deficient number, since it is larger than the sum of its proper divisors (286930047).

531245121 is a wasteful number, since it uses less digits than its factorization.

531245121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946992.

The product of its digits is 1200, while the sum is 24.

The square root of 531245121 is about 23048.7553026188. The cubic root of 531245121 is about 809.9004709289.

Adding to 531245121 its reverse (121542135), we get a palindrome (652787256).

The spelling of 531245121 in words is "five hundred thirty-one million, two hundred forty-five thousand, one hundred twenty-one".