641889225 has 24 divisors (see below), whose sum is σ = 1179175520. Its totient is φ = 342340560.

The previous prime is 641889223. The next prime is 641889257. The reversal of 641889225 is 522988146.

641889225 is a `hidden beast` number, since 6 + 418 + 8 + 9 + 225 = 666.

It is not a de Polignac number, because 641889225 - 2¹ = 641889223 is a prime.

It is a super-2 number, since 2×641889225² = 824043554342201250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (641889223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 474799 + ... + 476148.

Almost surely, 2^641889225 is an apocalyptic number.

It is an amenable number.

641889225 is a deficient number, since it is larger than the sum of its proper divisors (537286295).

641889225 is a wasteful number, since it uses less digits than its factorization.

641889225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950966 (or 950955 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 641889225 is about 25335.5328540767. The cubic root of 641889225 is about 862.6210038170.

The spelling of 641889225 in words is "six hundred forty-one million, eight hundred eighty-nine thousand, two hundred twenty-five".