521123245 has 8 divisors (see below), whose sum is σ = 625726584. Its totient is φ = 416646144.

The previous prime is 521123221. The next prime is 521123293. The reversal of 521123245 is 542321125.

It can be written as a sum of positive squares in 4 ways, for example, as 129914404 + 391208841 = 11398^2 + 19779^2 .

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 521123245 - 2¹⁹ = 520598957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22224 + ... + 39193.

It is an arithmetic number, because the mean of its divisors is an integer number (78215823).

Almost surely, 2^521123245 is an apocalyptic number.

It is an amenable number.

521123245 is a deficient number, since it is larger than the sum of its proper divisors (104603339).

521123245 is a wasteful number, since it uses less digits than its factorization.

521123245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63119.

The product of its digits is 2400, while the sum is 25.

The square root of 521123245 is about 22828.1239921287. The cubic root of 521123245 is about 804.7237430209.

The spelling of 521123245 in words is "five hundred twenty-one million, one hundred twenty-three thousand, two hundred forty-five".