163391955 has 8 divisors (see below), whose sum is σ = 261427152. Its totient is φ = 87142368.

The previous prime is 163391953. The next prime is 163391957. The reversal of 163391955 is 559193361.

It is an interprime number because it is at equal distance from previous prime (163391953) and next prime (163391957).

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

It is not a de Polignac number, because 163391955 - 2¹ = 163391953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (163391953) 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, 5446384 + ... + 5446413.

It is an arithmetic number, because the mean of its divisors is an integer number (32678394).

Almost surely, 2^163391955 is an apocalyptic number.

163391955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

163391955 is a deficient number, since it is larger than the sum of its proper divisors (98035197).

163391955 is a wasteful number, since it uses less digits than its factorization.

163391955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10892805.

The product of its digits is 109350, while the sum is 42.

The square root of 163391955 is about 12782.4862605050. The cubic root of 163391955 is about 546.6930544883.

The spelling of 163391955 in words is "one hundred sixty-three million, three hundred ninety-one thousand, nine hundred fifty-five".