208765126931 has 4 divisors (see below), whose sum is σ = 208995298872. Its totient is φ = 208534954992.

The previous prime is 208765126901. The next prime is 208765126957. The reversal of 208765126931 is 139621567802.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208765126931 is a prime.

It is a super-2 number, since 2×208765126931² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 208765126931.

It is not an unprimeable number, because it can be changed into a prime (208765126901) 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, 115084610 + ... + 115086423.

It is an arithmetic number, because the mean of its divisors is an integer number (52248824718).

Almost surely, 2^208765126931 is an apocalyptic number.

208765126931 is a deficient number, since it is larger than the sum of its proper divisors (230171941).

208765126931 is an equidigital number, since it uses as much as digits as its factorization.

208765126931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230171940.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 208765126931 in words is "two hundred eight billion, seven hundred sixty-five million, one hundred twenty-six thousand, nine hundred thirty-one".