520431553 has 2 divisors, whose sum is σ = 520431554. Its totient is φ = 520431552.

The previous prime is 520431533. The next prime is 520431559. The reversal of 520431553 is 355134025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 482768784 + 37662769 = 21972^2 + 6137^2 .

It is a cyclic number.

It is not a de Polignac number, because 520431553 - 2²⁵ = 486877121 is a prime.

It is not a weakly prime, because it can be changed into another prime (520431559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260215776 + 260215777.

It is an arithmetic number, because the mean of its divisors is an integer number (260215777).

Almost surely, 2^520431553 is an apocalyptic number.

It is an amenable number.

520431553 is a deficient number, since it is larger than the sum of its proper divisors (1).

520431553 is an equidigital number, since it uses as much as digits as its factorization.

520431553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9000, while the sum is 28.

The square root of 520431553 is about 22812.9689650427. The cubic root of 520431553 is about 804.3675461379.

Adding to 520431553 its reverse (355134025), we get a palindrome (875565578).

The spelling of 520431553 in words is "five hundred twenty million, four hundred thirty-one thousand, five hundred fifty-three".