521142233 has 4 divisors (see below), whose sum is σ = 522143028. Its totient is φ = 520141440.

The previous prime is 521142227. The next prime is 521142247. The reversal of 521142233 is 332241125.

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 146216464 + 374925769 = 12092^2 + 19363^2 .

It is a cyclic number.

It is not a de Polignac number, because 521142233 - 2⁴ = 521142217 is a prime.

It is a Duffinian number.

521142233 is a modest number, since divided by 142233 gives 521 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 521142199 and 521142208.

It is not an unprimeable number, because it can be changed into a prime (521142283) 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, 499616 + ... + 500657.

It is an arithmetic number, because the mean of its divisors is an integer number (130535757).

Almost surely, 2^521142233 is an apocalyptic number.

It is an amenable number.

521142233 is a deficient number, since it is larger than the sum of its proper divisors (1000795).

521142233 is a wasteful number, since it uses less digits than its factorization.

521142233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000794.

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

The square root of 521142233 is about 22828.5398788446. The cubic root of 521142233 is about 804.7335167222.

Adding to 521142233 its reverse (332241125), we get a palindrome (853383358).

The spelling of 521142233 in words is "five hundred twenty-one million, one hundred forty-two thousand, two hundred thirty-three".