521106253 has 4 divisors (see below), whose sum is σ = 551759580. Its totient is φ = 490452928.

The previous prime is 521106251. The next prime is 521106259. The reversal of 521106253 is 352601125.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 210888484 + 310217769 = 14522^2 + 17613^2 .

It is a cyclic number.

It is not a de Polignac number, because 521106253 - 2¹ = 521106251 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 (521106251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15326638 + ... + 15326671.

It is an arithmetic number, because the mean of its divisors is an integer number (137939895).

Almost surely, 2^521106253 is an apocalyptic number.

It is an amenable number.

521106253 is a deficient number, since it is larger than the sum of its proper divisors (30653327).

521106253 is a wasteful number, since it uses less digits than its factorization.

521106253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30653326.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 521106253 is about 22827.7518165938. The cubic root of 521106253 is about 804.7149965202.

Adding to 521106253 its reverse (352601125), we get a palindrome (873707378).

The spelling of 521106253 in words is "five hundred twenty-one million, one hundred six thousand, two hundred fifty-three".