208831137 has 16 divisors (see below), whose sum is σ = 280482048. Its totient is φ = 138205440.

The previous prime is 208831127. The next prime is 208831141. The reversal of 208831137 is 731138802.

It is a de Polignac number, because none of the positive numbers 2^k-208831137 is a prime.

It is a super-2 number, since 2×208831137² = 87220887561425538, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 208831098 and 208831107.

It is not an unprimeable number, because it can be changed into a prime (208831127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 482073 + ... + 482505.

It is an arithmetic number, because the mean of its divisors is an integer number (17530128).

Almost surely, 2^208831137 is an apocalyptic number.

It is an amenable number.

208831137 is a deficient number, since it is larger than the sum of its proper divisors (71650911).

208831137 is a wasteful number, since it uses less digits than its factorization.

208831137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 208831137 is about 14450.9908656811. The cubic root of 208831137 is about 593.2873443784.

Adding to 208831137 its reverse (731138802), we get a palindrome (939969939).

The spelling of 208831137 in words is "two hundred eight million, eight hundred thirty-one thousand, one hundred thirty-seven".