208391313 has 8 divisors (see below), whose sum is σ = 299228608. Its totient is φ = 128240784.

The previous prime is 208391299. The next prime is 208391317. The reversal of 208391313 is 313193802.

208391313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 208391313 - 2²¹ = 206294161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (208391317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2671645 + ... + 2671722.

It is an arithmetic number, because the mean of its divisors is an integer number (37403576).

Almost surely, 2^208391313 is an apocalyptic number.

It is an amenable number.

208391313 is a deficient number, since it is larger than the sum of its proper divisors (90837295).

208391313 is a wasteful number, since it uses less digits than its factorization.

208391313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5343383.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 208391313 is about 14435.7650645887. The cubic root of 208391313 is about 592.8705396443.

The spelling of 208391313 in words is "two hundred eight million, three hundred ninety-one thousand, three hundred thirteen".