168840031 has 4 divisors (see below), whose sum is σ = 170737200. Its totient is φ = 166942864.

The previous prime is 168840013. The next prime is 168840037. The reversal of 168840031 is 130048861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130048861 = 17 ⋅7649933.

It is a cyclic number.

It is not a de Polignac number, because 168840031 - 2⁵ = 168839999 is a prime.

It is a super-2 number, since 2×168840031² = 57013912136161922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 168839975 and 168840002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168840037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 948451 + ... + 948628.

It is an arithmetic number, because the mean of its divisors is an integer number (42684300).

Almost surely, 2^168840031 is an apocalyptic number.

168840031 is a deficient number, since it is larger than the sum of its proper divisors (1897169).

168840031 is an equidigital number, since it uses as much as digits as its factorization.

168840031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1897168.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 168840031 is about 12993.8458894971. The cubic root of 168840031 is about 552.7029820026.

Adding to 168840031 its reverse (130048861), we get a palindrome (298888892).

The spelling of 168840031 in words is "one hundred sixty-eight million, eight hundred forty thousand, thirty-one".