168142251 has 8 divisors (see below), whose sum is σ = 224988624. Its totient is φ = 111695360.

The previous prime is 168142241. The next prime is 168142277. The reversal of 168142251 is 152241861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 168142251 - 2¹⁰ = 168141227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (168142241) 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 7 ways as a sum of consecutive naturals, for example, 98886 + ... + 100571.

It is an arithmetic number, because the mean of its divisors is an integer number (28123578).

Almost surely, 2^168142251 is an apocalyptic number.

168142251 is a deficient number, since it is larger than the sum of its proper divisors (56846373).

168142251 is a wasteful number, since it uses less digits than its factorization.

168142251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199741.

The product of its digits is 3840, while the sum is 30.

The square root of 168142251 is about 12966.9676871657. The cubic root of 168142251 is about 551.9405293261.

The spelling of 168142251 in words is "one hundred sixty-eight million, one hundred forty-two thousand, two hundred fifty-one".