521140343 has 2 divisors, whose sum is σ = 521140344. Its totient is φ = 521140342.

The previous prime is 521140331. The next prime is 521140351. The reversal of 521140343 is 343041125.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 521140343 - 2¹⁴ = 521123959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521140313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260570171 + 260570172.

It is an arithmetic number, because the mean of its divisors is an integer number (260570172).

Almost surely, 2^521140343 is an apocalyptic number.

521140343 is a deficient number, since it is larger than the sum of its proper divisors (1).

521140343 is an equidigital number, since it uses as much as digits as its factorization.

521140343 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 521140343 is about 22828.4984832555. The cubic root of 521140343 is about 804.7325438923.

Adding to 521140343 its reverse (343041125), we get a palindrome (864181468).

It can be divided in two parts, 5211 and 40343, that added together give a palindrome (45554).

The spelling of 521140343 in words is "five hundred twenty-one million, one hundred forty thousand, three hundred forty-three".