163421325 has 54 divisors (see below), whose sum is σ = 306208266. Its totient is φ = 83307840.

The previous prime is 163421317. The next prime is 163421329. The reversal of 163421325 is 523124361.

163421325 is a `hidden beast` number, since 1 + 634 + 2 + 1 + 3 + 25 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 50509449 + 112911876 = 7107^2 + 10626^2 .

It is not a de Polignac number, because 163421325 - 2³ = 163421317 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163421329) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 118339 + ... + 119711.

Almost surely, 2^163421325 is an apocalyptic number.

163421325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

163421325 is a deficient number, since it is larger than the sum of its proper divisors (142786941).

163421325 is a wasteful number, since it uses less digits than its factorization.

163421325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1435 (or 1404 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 163421325 is about 12783.6350464177. The cubic root of 163421325 is about 546.7258088816.

Adding to 163421325 its reverse (523124361), we get a palindrome (686545686).

The spelling of 163421325 in words is "one hundred sixty-three million, four hundred twenty-one thousand, three hundred twenty-five".