163521445 has 8 divisors (see below), whose sum is σ = 196745760. Its totient is φ = 130470480.

The previous prime is 163521443. The next prime is 163521469. The reversal of 163521445 is 544125361.

It is a happy number.

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

It is not a de Polignac number, because 163521445 - 2¹ = 163521443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163521443) 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, 41251 + ... + 45040.

It is an arithmetic number, because the mean of its divisors is an integer number (24593220).

Almost surely, 2^163521445 is an apocalyptic number.

It is an amenable number.

163521445 is a deficient number, since it is larger than the sum of its proper divisors (33224315).

163521445 is an equidigital number, since it uses as much as digits as its factorization.

163521445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86675.

The product of its digits is 14400, while the sum is 31.

The square root of 163521445 is about 12787.5503909076. The cubic root of 163521445 is about 546.8374365274.

The spelling of 163521445 in words is "one hundred sixty-three million, five hundred twenty-one thousand, four hundred forty-five".