163494789 has 4 divisors (see below), whose sum is σ = 217993056. Its totient is φ = 108996524.

The previous prime is 163494781. The next prime is 163494809. The reversal of 163494789 is 987494361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 163494789 - 2³ = 163494781 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163494781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27249129 + ... + 27249134.

It is an arithmetic number, because the mean of its divisors is an integer number (54498264).

Almost surely, 2^163494789 is an apocalyptic number.

It is an amenable number.

163494789 is a deficient number, since it is larger than the sum of its proper divisors (54498267).

163494789 is an equidigital number, since it uses as much as digits as its factorization.

163494789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54498266.

The product of its digits is 1306368, while the sum is 51.

The square root of 163494789 is about 12786.5080846961. The cubic root of 163494789 is about 546.8077211776.

The spelling of 163494789 in words is "one hundred sixty-three million, four hundred ninety-four thousand, seven hundred eighty-nine".