208902929481 has 27 divisors (see below), whose sum is σ = 304331361997. Its totient is φ = 138086665080.

The previous prime is 208902929467. The next prime is 208902929527. The reversal of 208902929481 is 184929209802.

The square root of 208902929481 is 457059.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 208902929481 - 2¹³ = 208902921289 is a prime.

It is a super-2 number, since 2×208902929481² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208902929281) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 179623606 + ... + 179624768.

Almost surely, 2^208902929481 is an apocalyptic number.

208902929481 is the 457059-th square number.

208902929481 is the 228530-th centered octagonal number.

It is an amenable number.

208902929481 is a deficient number, since it is larger than the sum of its proper divisors (95428432516).

208902929481 is an frugal number, since it uses more digits than its factorization.

208902929481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594 (or 1297 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The spelling of 208902929481 in words is "two hundred eight billion, nine hundred two million, nine hundred twenty-nine thousand, four hundred eighty-one".