8490209281 has 4 divisors (see below), whose sum is σ = 8527611312. Its totient is φ = 8452807252.

The previous prime is 8490209279. The next prime is 8490209293. The reversal of 8490209281 is 1829020948.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8490209281 - 2¹ = 8490209279 is a prime.

It is a super-2 number, since 2×8490209281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8490209251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18700675 + ... + 18701128.

It is an arithmetic number, because the mean of its divisors is an integer number (2131902828).

Almost surely, 2^8490209281 is an apocalyptic number.

It is an amenable number.

8490209281 is a deficient number, since it is larger than the sum of its proper divisors (37402031).

8490209281 is a wasteful number, since it uses less digits than its factorization.

8490209281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37402030.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 8490209281 is about 92142.3316451239. The cubic root of 8490209281 is about 2040.0436746545.

The spelling of 8490209281 in words is "eight billion, four hundred ninety million, two hundred nine thousand, two hundred eighty-one".