163420431 has 4 divisors (see below), whose sum is σ = 217893912. Its totient is φ = 108946952.

The previous prime is 163420429. The next prime is 163420441. The reversal of 163420431 is 134024361.

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 163420431 - 2¹ = 163420429 is a prime.

It is a super-2 number, since 2×163420431² = 53412474536451522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163420441) 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, 27236736 + ... + 27236741.

It is an arithmetic number, because the mean of its divisors is an integer number (54473478).

Almost surely, 2^163420431 is an apocalyptic number.

163420431 is a deficient number, since it is larger than the sum of its proper divisors (54473481).

163420431 is an equidigital number, since it uses as much as digits as its factorization.

163420431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54473480.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 163420431 is about 12783.6000797897. The cubic root of 163420431 is about 546.7248119212.

Adding to 163420431 its reverse (134024361), we get a palindrome (297444792).

The spelling of 163420431 in words is "one hundred sixty-three million, four hundred twenty thousand, four hundred thirty-one".