168971613 has 4 divisors (see below), whose sum is σ = 225295488. Its totient is φ = 112647740.

The previous prime is 168971609. The next prime is 168971629. The reversal of 168971613 is 316179861.

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 not a de Polignac number, because 168971613 - 2² = 168971609 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168971633) 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, 28161933 + ... + 28161938.

It is an arithmetic number, because the mean of its divisors is an integer number (56323872).

Almost surely, 2^168971613 is an apocalyptic number.

It is an amenable number.

168971613 is a deficient number, since it is larger than the sum of its proper divisors (56323875).

168971613 is an equidigital number, since it uses as much as digits as its factorization.

168971613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56323874.

The product of its digits is 54432, while the sum is 42.

The square root of 168971613 is about 12998.9081464560. The cubic root of 168971613 is about 552.8465239480.

The spelling of 168971613 in words is "one hundred sixty-eight million, nine hundred seventy-one thousand, six hundred thirteen".