8490361821 has 4 divisors (see below), whose sum is σ = 11320482432. Its totient is φ = 5660241212.

The previous prime is 8490361819. The next prime is 8490361849. The reversal of 8490361821 is 1281630948.

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 8490361821 - 2¹ = 8490361819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8490361021) 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, 1415060301 + ... + 1415060306.

It is an arithmetic number, because the mean of its divisors is an integer number (2830120608).

Almost surely, 2^8490361821 is an apocalyptic number.

It is an amenable number.

8490361821 is a deficient number, since it is larger than the sum of its proper divisors (2830120611).

8490361821 is a wasteful number, since it uses less digits than its factorization.

8490361821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830120610.

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 8490361821 is about 92143.1593825608. The cubic root of 8490361821 is about 2040.0558921153.

The spelling of 8490361821 in words is "eight billion, four hundred ninety million, three hundred sixty-one thousand, eight hundred twenty-one".