163520906 has 4 divisors (see below), whose sum is σ = 245281362. Its totient is φ = 81760452.

The previous prime is 163520893. The next prime is 163520921. The reversal of 163520906 is 609025361.

It is a happy number.

163520906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 161518681 + 2002225 = 12709^2 + 1415^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40880225 + ... + 40880228.

Almost surely, 2^163520906 is an apocalyptic number.

163520906 is a deficient number, since it is larger than the sum of its proper divisors (81760456).

163520906 is an equidigital number, since it uses as much as digits as its factorization.

163520906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81760455.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 163520906 is about 12787.5293157044. The cubic root of 163520906 is about 546.8368356975.

The spelling of 163520906 in words is "one hundred sixty-three million, five hundred twenty thousand, nine hundred six".