525402221 has 4 divisors (see below), whose sum is σ = 556308252. Its totient is φ = 494496192.

The previous prime is 525402217. The next prime is 525402223. The reversal of 525402221 is 122204525.

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 441588196 + 83814025 = 21014^2 + 9155^2 .

It is a cyclic number.

It is not a de Polignac number, because 525402221 - 2² = 525402217 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 (525402223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15452990 + ... + 15453023.

It is an arithmetic number, because the mean of its divisors is an integer number (139077063).

Almost surely, 2^525402221 is an apocalyptic number.

It is an amenable number.

525402221 is a deficient number, since it is larger than the sum of its proper divisors (30906031).

525402221 is a wasteful number, since it uses less digits than its factorization.

525402221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30906030.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 525402221 is about 22921.6539760987. The cubic root of 525402221 is about 806.9202878456.

Adding to 525402221 its reverse (122204525), we get a palindrome (647606746).

The spelling of 525402221 in words is "five hundred twenty-five million, four hundred two thousand, two hundred twenty-one".