168992013 has 4 divisors (see below), whose sum is σ = 225322688. Its totient is φ = 112661340.

The previous prime is 168991973. The next prime is 168992027. The reversal of 168992013 is 310299861.

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 not a de Polignac number, because 168992013 - 2¹⁷ = 168860941 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 (168992093) 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, 28165333 + ... + 28165338.

It is an arithmetic number, because the mean of its divisors is an integer number (56330672).

Almost surely, 2^168992013 is an apocalyptic number.

It is an amenable number.

168992013 is a deficient number, since it is larger than the sum of its proper divisors (56330675).

168992013 is an equidigital number, since it uses as much as digits as its factorization.

168992013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56330674.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 168992013 is about 12999.6928040627. The cubic root of 168992013 is about 552.8687715020.

The spelling of 168992013 in words is "one hundred sixty-eight million, nine hundred ninety-two thousand, thirteen".