252520440401 has 4 divisors (see below), whose sum is σ = 267374583972. Its totient is φ = 237666296832.

The previous prime is 252520440349. The next prime is 252520440413. The reversal of 252520440401 is 104044025252.

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 89081356225 + 163439084176 = 298465^2 + 404276^2 .

It is a cyclic number.

It is not a de Polignac number, because 252520440401 - 2¹⁰ = 252520439377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (252520440421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7427071760 + ... + 7427071793.

It is an arithmetic number, because the mean of its divisors is an integer number (66843645993).

Almost surely, 2^252520440401 is an apocalyptic number.

It is an amenable number.

252520440401 is a deficient number, since it is larger than the sum of its proper divisors (14854143571).

252520440401 is a wasteful number, since it uses less digits than its factorization.

252520440401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14854143570.

The product of its (nonzero) digits is 12800, while the sum is 29.

Adding to 252520440401 its reverse (104044025252), we get a palindrome (356564465653).

The spelling of 252520440401 in words is "two hundred fifty-two billion, five hundred twenty million, four hundred forty thousand, four hundred one".