163420525 has 24 divisors (see below), whose sum is σ = 208198728. Its totient is φ = 127200000.

The previous prime is 163420519. The next prime is 163420531. The reversal of 163420525 is 525024361.

It is an interprime number because it is at equal distance from previous prime (163420519) and next prime (163420531).

It can be written as a sum of positive squares in 12 ways, for example, as 32592681 + 130827844 = 5709^2 + 11438^2 .

It is not a de Polignac number, because 163420525 - 2²¹ = 161323373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 163420493 and 163420502.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 153495 + ... + 154555.

It is an arithmetic number, because the mean of its divisors is an integer number (8674947).

Almost surely, 2^163420525 is an apocalyptic number.

It is an amenable number.

163420525 is a deficient number, since it is larger than the sum of its proper divisors (44778203).

163420525 is a wasteful number, since it uses less digits than its factorization.

163420525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233 (or 1228 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 163420525 is about 12783.6037563748. The cubic root of 163420525 is about 546.7249167472.

Adding to 163420525 its reverse (525024361), we get a palindrome (688444886).

The spelling of 163420525 in words is "one hundred sixty-three million, four hundred twenty thousand, five hundred twenty-five".