168542631 has 12 divisors (see below), whose sum is σ = 244314408. Its totient is φ = 111963024.

The previous prime is 168542581. The next prime is 168542657. The reversal of 168542631 is 136245861.

It is a happy number.

168542631 is a `hidden beast` number, since 16 + 8 + 5 + 4 + 2 + 631 = 666.

It is not a de Polignac number, because 168542631 - 2¹³ = 168534439 is a prime.

It is a super-2 number, since 2×168542631² = 56813236928804322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168542681) 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 11 ways as a sum of consecutive naturals, for example, 30540 + ... + 35633.

It is an arithmetic number, because the mean of its divisors is an integer number (20359534).

Almost surely, 2^168542631 is an apocalyptic number.

168542631 is a deficient number, since it is larger than the sum of its proper divisors (75771777).

168542631 is a wasteful number, since it uses less digits than its factorization.

168542631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66462 (or 66459 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 168542631 is about 12982.3969666622. The cubic root of 168542631 is about 552.3782752936.

The spelling of 168542631 in words is "one hundred sixty-eight million, five hundred forty-two thousand, six hundred thirty-one".