163311431 has 16 divisors (see below), whose sum is σ = 174763008. Its totient is φ = 152275200.

The previous prime is 163311427. The next prime is 163311433. The reversal of 163311431 is 134113361.

It is a cyclic number.

It is not a de Polignac number, because 163311431 - 2² = 163311427 is a prime.

It is a super-2 number, since 2×163311431² = 53341246990535522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 163311397 and 163311406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163311433) 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, 157886 + ... + 158916.

It is an arithmetic number, because the mean of its divisors is an integer number (10922688).

Almost surely, 2^163311431 is an apocalyptic number.

163311431 is a deficient number, since it is larger than the sum of its proper divisors (11451577).

163311431 is a wasteful number, since it uses less digits than its factorization.

163311431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222.

The product of its digits is 648, while the sum is 23.

The square root of 163311431 is about 12779.3360938665. The cubic root of 163311431 is about 546.6032313282.

Adding to 163311431 its reverse (134113361), we get a palindrome (297424792).

The spelling of 163311431 in words is "one hundred sixty-three million, three hundred eleven thousand, four hundred thirty-one".