163725481 has 8 divisors (see below), whose sum is σ = 168463880. Its totient is φ = 159003648.

The previous prime is 163725473. The next prime is 163725517. The reversal of 163725481 is 184527361.

It can be written as a sum of positive squares in 4 ways, for example, as 147403881 + 16321600 = 12141^2 + 4040^2 .

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 163725481 - 2³ = 163725473 is a prime.

It is a super-2 number, since 2×163725481² = 53612066257362722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 163725481.

It is not an unprimeable number, because it can be changed into a prime (163725781) 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, 17515 + ... + 25183.

It is an arithmetic number, because the mean of its divisors is an integer number (21057985).

Almost surely, 2^163725481 is an apocalyptic number.

It is an amenable number.

163725481 is a deficient number, since it is larger than the sum of its proper divisors (4738399).

163725481 is an equidigital number, since it uses as much as digits as its factorization.

163725481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8283.

The product of its digits is 40320, while the sum is 37.

The square root of 163725481 is about 12795.5258195980. The cubic root of 163725481 is about 547.0647831590.

The spelling of 163725481 in words is "one hundred sixty-three million, seven hundred twenty-five thousand, four hundred eighty-one".