168431261 has 4 divisors (see below), whose sum is σ = 168459900. Its totient is φ = 168402624.

The previous prime is 168431227. The next prime is 168431267. The reversal of 168431261 is 162134861.

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 139476100 + 28955161 = 11810^2 + 5381^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168431261 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 (168431267) 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, 1916 + ... + 18453.

It is an arithmetic number, because the mean of its divisors is an integer number (42114975).

Almost surely, 2^168431261 is an apocalyptic number.

It is an amenable number.

168431261 is a deficient number, since it is larger than the sum of its proper divisors (28639).

168431261 is an equidigital number, since it uses as much as digits as its factorization.

168431261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28638.

The product of its digits is 6912, while the sum is 32.

The square root of 168431261 is about 12978.1069883092. The cubic root of 168431261 is about 552.2565812090.

The spelling of 168431261 in words is "one hundred sixty-eight million, four hundred thirty-one thousand, two hundred sixty-one".