425535221 has 4 divisors (see below), whose sum is σ = 425576844. Its totient is φ = 425493600.

The previous prime is 425535197. The next prime is 425535239. The reversal of 425535221 is 122535524.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 217887121 + 207648100 = 14761^2 + 14410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-425535221 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 (425535421) 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, 6281 + ... + 29841.

It is an arithmetic number, because the mean of its divisors is an integer number (106394211).

Almost surely, 2^425535221 is an apocalyptic number.

It is an amenable number.

425535221 is a deficient number, since it is larger than the sum of its proper divisors (41623).

425535221 is a wasteful number, since it uses less digits than its factorization.

425535221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41622.

The product of its digits is 12000, while the sum is 29.

The square root of 425535221 is about 20628.5050597468. The cubic root of 425535221 is about 752.1627770507.

It can be divided in two parts, 42553 and 5221, that added together give a palindrome (47774).

The spelling of 425535221 in words is "four hundred twenty-five million, five hundred thirty-five thousand, two hundred twenty-one".