208487189401 has 4 divisors (see below), whose sum is σ = 208696304932. Its totient is φ = 208278073872.

The previous prime is 208487189399. The next prime is 208487189437. The reversal of 208487189401 is 104981784802.

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

It can be written as a sum of positive squares in 2 ways, for example, as 196497158400 + 11990031001 = 443280^2 + 109499^2 .

It is a cyclic number.

It is not a de Polignac number, because 208487189401 - 2¹ = 208487189399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208487189201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104556270 + ... + 104558263.

It is an arithmetic number, because the mean of its divisors is an integer number (52174076233).

Almost surely, 2^208487189401 is an apocalyptic number.

It is an amenable number.

208487189401 is a deficient number, since it is larger than the sum of its proper divisors (209115531).

208487189401 is an equidigital number, since it uses as much as digits as its factorization.

208487189401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209115530.

The product of its (nonzero) digits is 1032192, while the sum is 52.

The spelling of 208487189401 in words is "two hundred eight billion, four hundred eighty-seven million, one hundred eighty-nine thousand, four hundred one".