208191137 has 8 divisors (see below), whose sum is σ = 259563072. Its totient is φ = 162226800.

The previous prime is 208191131. The next prime is 208191157. The reversal of 208191137 is 731191802.

208191137 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 a cyclic number.

It is not a de Polignac number, because 208191137 - 2⁴ = 208191121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208191131) 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, 1351814 + ... + 1351967.

It is an arithmetic number, because the mean of its divisors is an integer number (32445384).

Almost surely, 2^208191137 is an apocalyptic number.

It is an amenable number.

208191137 is a deficient number, since it is larger than the sum of its proper divisors (51371935).

208191137 is a wasteful number, since it uses less digits than its factorization.

208191137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2703799.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 208191137 is about 14428.8300634528. The cubic root of 208191137 is about 592.6806461347.

The spelling of 208191137 in words is "two hundred eight million, one hundred ninety-one thousand, one hundred thirty-seven".