168145261 has 4 divisors (see below), whose sum is σ = 169084800. Its totient is φ = 167205724.

The previous prime is 168145183. The next prime is 168145291. The reversal of 168145261 is 162541861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168145261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168145291) 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, 469501 + ... + 469858.

It is an arithmetic number, because the mean of its divisors is an integer number (42271200).

Almost surely, 2^168145261 is an apocalyptic number.

It is an amenable number.

168145261 is a deficient number, since it is larger than the sum of its proper divisors (939539).

168145261 is an equidigital number, since it uses as much as digits as its factorization.

168145261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939538.

The product of its digits is 11520, while the sum is 34.

The square root of 168145261 is about 12967.0837507899. The cubic root of 168145261 is about 551.9438228292.

The spelling of 168145261 in words is "one hundred sixty-eight million, one hundred forty-five thousand, two hundred sixty-one".