225787621 has 8 divisors (see below), whose sum is σ = 240026400. Its totient is φ = 211784400.

The previous prime is 225787603. The next prime is 225787637. The reversal of 225787621 is 126787522.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 225787621 - 2¹³ = 225779429 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 (225787651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56911 + ... + 60748.

It is an arithmetic number, because the mean of its divisors is an integer number (30003300).

Almost surely, 2^225787621 is an apocalyptic number.

It is an amenable number.

225787621 is a deficient number, since it is larger than the sum of its proper divisors (14238779).

225787621 is a wasteful number, since it uses less digits than its factorization.

225787621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117779.

The product of its digits is 94080, while the sum is 40.

The square root of 225787621 is about 15026.2310976505. The cubic root of 225787621 is about 608.9290723163.

Subtracting from 225787621 its reverse (126787522), we obtain a palindrome (99000099).

The spelling of 225787621 in words is "two hundred twenty-five million, seven hundred eighty-seven thousand, six hundred twenty-one".