225520401 has 8 divisors (see below), whose sum is σ = 300788320. Its totient is φ = 150299712.

The previous prime is 225520397. The next prime is 225520409. The reversal of 225520401 is 104025522.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 225520401 - 2² = 225520397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225520409) 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 7 ways as a sum of consecutive naturals, for example, 1470 + ... + 21288.

It is an arithmetic number, because the mean of its divisors is an integer number (37598540).

Almost surely, 2^225520401 is an apocalyptic number.

It is an amenable number.

225520401 is a deficient number, since it is larger than the sum of its proper divisors (75267919).

225520401 is a wasteful number, since it uses less digits than its factorization.

225520401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23615.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 225520401 is about 15017.3366813160. The cubic root of 225520401 is about 608.6887546517.

Adding to 225520401 its reverse (104025522), we get a palindrome (329545923).

The spelling of 225520401 in words is "two hundred twenty-five million, five hundred twenty thousand, four hundred one".