531230121 has 6 divisors (see below), whose sum is σ = 767332410. Its totient is φ = 354153408.

The previous prime is 531230111. The next prime is 531230131. The reversal of 531230121 is 121032135.

It is an interprime number because it is at equal distance from previous prime (531230111) and next prime (531230131).

It can be written as a sum of positive squares in only one way, i.e., 336208896 + 195021225 = 18336^2 + 13965^2 .

It is a de Polignac number, because none of the positive numbers 2^k-531230121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 531230094 and 531230103.

It is not an unprimeable number, because it can be changed into a prime (531230111) 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 in 5 ways as a sum of consecutive naturals, for example, 29512776 + ... + 29512793.

It is an arithmetic number, because the mean of its divisors is an integer number (127888735).

Almost surely, 2^531230121 is an apocalyptic number.

It is an amenable number.

531230121 is a deficient number, since it is larger than the sum of its proper divisors (236102289).

531230121 is a wasteful number, since it uses less digits than its factorization.

531230121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59025575 (or 59025572 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 531230121 is about 23048.4299031409. The cubic root of 531230121 is about 809.8928481945.

Adding to 531230121 its reverse (121032135), we get a palindrome (652262256).

The spelling of 531230121 in words is "five hundred thirty-one million, two hundred thirty thousand, one hundred twenty-one".