163491801 has 16 divisors (see below), whose sum is σ = 238325760. Its totient is φ = 98869520.

The previous prime is 163491787. The next prime is 163491817. The reversal of 163491801 is 108194361.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163491801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (163491101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10636 + ... + 20978.

It is an arithmetic number, because the mean of its divisors is an integer number (14895360).

Almost surely, 2^163491801 is an apocalyptic number.

163491801 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

163491801 is a deficient number, since it is larger than the sum of its proper divisors (74833959).

163491801 is a wasteful number, since it uses less digits than its factorization.

163491801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10836.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 163491801 is about 12786.3912422544. The cubic root of 163491801 is about 546.8043900389.

The spelling of 163491801 in words is "one hundred sixty-three million, four hundred ninety-one thousand, eight hundred one".