163941905 has 8 divisors (see below), whose sum is σ = 197515584. Its totient is φ = 130630000.

The previous prime is 163941889. The next prime is 163941913. The reversal of 163941905 is 509149361.

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

It is not a de Polignac number, because 163941905 - 2⁴ = 163941889 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64061 + ... + 66570.

It is an arithmetic number, because the mean of its divisors is an integer number (24689448).

Almost surely, 2^163941905 is an apocalyptic number.

It is an amenable number.

163941905 is a deficient number, since it is larger than the sum of its proper divisors (33573679).

163941905 is a wasteful number, since it uses less digits than its factorization.

163941905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130887.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 163941905 is about 12803.9800452828. The cubic root of 163941905 is about 547.3057267540.

The spelling of 163941905 in words is "one hundred sixty-three million, nine hundred forty-one thousand, nine hundred five".