521531441 has 2 divisors, whose sum is σ = 521531442. Its totient is φ = 521531440.

The previous prime is 521531431. The next prime is 521531473. The reversal of 521531441 is 144135125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 469979041 + 51552400 = 21679^2 + 7180^2 .

It is a cyclic number.

It is not a de Polignac number, because 521531441 - 2¹⁸ = 521269297 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 521531441.

It is not a weakly prime, because it can be changed into another prime (521531431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260765720 + 260765721.

It is an arithmetic number, because the mean of its divisors is an integer number (260765721).

Almost surely, 2^521531441 is an apocalyptic number.

It is an amenable number.

521531441 is a deficient number, since it is larger than the sum of its proper divisors (1).

521531441 is an equidigital number, since it uses as much as digits as its factorization.

521531441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 26.

The square root of 521531441 is about 22837.0628803268. The cubic root of 521531441 is about 804.9338016369.

Adding to 521531441 its reverse (144135125), we get a palindrome (665666566).

The spelling of 521531441 in words is "five hundred twenty-one million, five hundred thirty-one thousand, four hundred forty-one".