521540053 has 2 divisors, whose sum is σ = 521540054. Its totient is φ = 521540052.

The previous prime is 521540051. The next prime is 521540069. The reversal of 521540053 is 350045125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 497156209 + 24383844 = 22297^2 + 4938^2 .

It is a cyclic number.

It is not a de Polignac number, because 521540053 - 2¹ = 521540051 is a prime.

Together with 521540051, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521540051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260770026 + 260770027.

It is an arithmetic number, because the mean of its divisors is an integer number (260770027).

Almost surely, 2^521540053 is an apocalyptic number.

It is an amenable number.

521540053 is a deficient number, since it is larger than the sum of its proper divisors (1).

521540053 is an equidigital number, since it uses as much as digits as its factorization.

521540053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 521540053 is about 22837.2514326922. The cubic root of 521540053 is about 804.9382322114.

Adding to 521540053 its reverse (350045125), we get a palindrome (871585178).

The spelling of 521540053 in words is "five hundred twenty-one million, five hundred forty thousand, fifty-three".