163389431 has 4 divisors (see below), whose sum is σ = 173000592. Its totient is φ = 153778272.

The previous prime is 163389427. The next prime is 163389433. The reversal of 163389431 is 134983361.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 163389431 - 2² = 163389427 is a prime.

It is a super-2 number, since 2×163389431² = 53392212325007522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163389433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4805555 + ... + 4805588.

It is an arithmetic number, because the mean of its divisors is an integer number (43250148).

Almost surely, 2^163389431 is an apocalyptic number.

163389431 is a deficient number, since it is larger than the sum of its proper divisors (9611161).

163389431 is an equidigital number, since it uses as much as digits as its factorization.

163389431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9611160.

The product of its digits is 46656, while the sum is 38.

The square root of 163389431 is about 12782.3875312869. The cubic root of 163389431 is about 546.6902394571.

The spelling of 163389431 in words is "one hundred sixty-three million, three hundred eighty-nine thousand, four hundred thirty-one".