168124381 has 4 divisors (see below), whose sum is σ = 168261532. Its totient is φ = 167987232.

The previous prime is 168124351. The next prime is 168124391. The reversal of 168124381 is 183421861.

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

It can be written as a sum of positive squares in 2 ways, for example, as 127916100 + 40208281 = 11310^2 + 6341^2 .

It is a cyclic number.

It is not a de Polignac number, because 168124381 - 2⁵ = 168124349 is a prime.

It is a super-2 number, since 2×168124381² = 56531614973266322, 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 (168124301) 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, 66720 + ... + 69193.

It is an arithmetic number, because the mean of its divisors is an integer number (42065383).

Almost surely, 2^168124381 is an apocalyptic number.

It is an amenable number.

168124381 is a deficient number, since it is larger than the sum of its proper divisors (137151).

168124381 is a wasteful number, since it uses less digits than its factorization.

168124381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137150.

The product of its digits is 9216, while the sum is 34.

The square root of 168124381 is about 12966.2786103030. The cubic root of 168124381 is about 551.9209753936.

It can be divided in two parts, 1681 and 24381, that added together give a palindrome (26062).

The spelling of 168124381 in words is "one hundred sixty-eight million, one hundred twenty-four thousand, three hundred eighty-one".