8461881649 has 8 divisors (see below), whose sum is σ = 9131514560. Its totient is φ = 7794922896.

The previous prime is 8461881641. The next prime is 8461881671. The reversal of 8461881649 is 9461881648.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8461881649 - 2³ = 8461881641 is a prime.

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 8461881649.

It is not an unprimeable number, because it can be changed into a prime (8461881641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 661959 + ... + 674620.

It is an arithmetic number, because the mean of its divisors is an integer number (1141439320).

Almost surely, 2^8461881649 is an apocalyptic number.

It is an amenable number.

8461881649 is a deficient number, since it is larger than the sum of its proper divisors (669632911).

8461881649 is a wasteful number, since it uses less digits than its factorization.

8461881649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337079.

The product of its digits is 2654208, while the sum is 55.

The square root of 8461881649 is about 91988.4865023879. The cubic root of 8461881649 is about 2037.7722741212.

Subtracting 8461881649 from its reverse (9461881648), we obtain a palindrome (999999999).

The spelling of 8461881649 in words is "eight billion, four hundred sixty-one million, eight hundred eighty-one thousand, six hundred forty-nine".