531121 has 2 divisors, whose sum is σ = 531122. Its totient is φ = 531120.

The previous prime is 531103. The next prime is 531133. The reversal of 531121 is 121135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 505521 + 25600 = 711^2 + 160^2 .

It is a cyclic number.

It is not a de Polignac number, because 531121 - 2⁹ = 530609 is a prime.

It is not a weakly prime, because it can be changed into another prime (531101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265560 + 265561.

It is an arithmetic number, because the mean of its divisors is an integer number (265561).

2⁵³¹¹²¹ is an apocalyptic number.

It is an amenable number.

531121 is a deficient number, since it is larger than the sum of its proper divisors (1).

531121 is an equidigital number, since it uses as much as digits as its factorization.

531121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30, while the sum is 13.

The square root of 531121 is about 728.7804882130. The cubic root of 531121 is about 80.9837390515.

Adding to 531121 its reverse (121135), we get a palindrome (652256).

The spelling of 531121 in words is "five hundred thirty-one thousand, one hundred twenty-one".