521542253 has 8 divisors (see below), whose sum is σ = 530751000. Its totient is φ = 512354880.

The previous prime is 521542249. The next prime is 521542277. The reversal of 521542253 is 352245125.

It can be written as a sum of positive squares in 4 ways, for example, as 3433609 + 518108644 = 1853^2 + 22762^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 521542253 - 2² = 521542249 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521542213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48623 + ... + 58371.

It is an arithmetic number, because the mean of its divisors is an integer number (66343875).

Almost surely, 2^521542253 is an apocalyptic number.

It is an amenable number.

521542253 is a deficient number, since it is larger than the sum of its proper divisors (9208747).

521542253 is an equidigital number, since it uses as much as digits as its factorization.

521542253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10687.

The product of its digits is 12000, while the sum is 29.

The square root of 521542253 is about 22837.2995995586. The cubic root of 521542253 is about 804.9393640271.

Adding to 521542253 its reverse (352245125), we get a palindrome (873787378).

The spelling of 521542253 in words is "five hundred twenty-one million, five hundred forty-two thousand, two hundred fifty-three".