525116221 has 16 divisors (see below), whose sum is σ = 605329920. Its totient is φ = 446221440.

The previous prime is 525116201. The next prime is 525116231. The reversal of 525116221 is 122611525.

It is not a de Polignac number, because 525116221 - 2¹⁵ = 525083453 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 (525116201) 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 15 ways as a sum of consecutive naturals, for example, 469555 + ... + 470671.

It is an arithmetic number, because the mean of its divisors is an integer number (37833120).

Almost surely, 2^525116221 is an apocalyptic number.

It is an amenable number.

525116221 is a deficient number, since it is larger than the sum of its proper divisors (80213699).

525116221 is a wasteful number, since it uses less digits than its factorization.

525116221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644.

The product of its digits is 1200, while the sum is 25.

The square root of 525116221 is about 22915.4144845778. The cubic root of 525116221 is about 806.7738469664.

Adding to 525116221 its reverse (122611525), we get a palindrome (647727746).

The spelling of 525116221 in words is "five hundred twenty-five million, one hundred sixteen thousand, two hundred twenty-one".