521261203 has 4 divisors (see below), whose sum is σ = 525874248. Its totient is φ = 516648160.

The previous prime is 521261189. The next prime is 521261227. The reversal of 521261203 is 302162125.

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

It is a cyclic number.

It is not a de Polignac number, because 521261203 - 2²⁵ = 487706771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521261233) 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, 2306353 + ... + 2306578.

It is an arithmetic number, because the mean of its divisors is an integer number (131468562).

Almost surely, 2^521261203 is an apocalyptic number.

521261203 is a deficient number, since it is larger than the sum of its proper divisors (4613045).

521261203 is a wasteful number, since it uses less digits than its factorization.

521261203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4613044.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 521261203 is about 22831.1454596566. The cubic root of 521261203 is about 804.7947487980.

The spelling of 521261203 in words is "five hundred twenty-one million, two hundred sixty-one thousand, two hundred three".