8921494487 has 4 divisors (see below), whose sum is σ = 8937341400. Its totient is φ = 8905647576.

The previous prime is 8921494451. The next prime is 8921494493. The reversal of 8921494487 is 7844941298.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7844941298 = 2 ⋅3922470649.

It is a cyclic number.

It is not a de Polignac number, because 8921494487 - 2⁶ = 8921494423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8921493487) 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, 7922612 + ... + 7923737.

It is an arithmetic number, because the mean of its divisors is an integer number (2234335350).

Almost surely, 2^8921494487 is an apocalyptic number.

8921494487 is a deficient number, since it is larger than the sum of its proper divisors (15846913).

8921494487 is a wasteful number, since it uses less digits than its factorization.

8921494487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15846912.

The product of its digits is 4644864, while the sum is 56.

The square root of 8921494487 is about 94453.6631740665. The cubic root of 8921494487 is about 2074.0180760408.

The spelling of 8921494487 in words is "eight billion, nine hundred twenty-one million, four hundred ninety-four thousand, four hundred eighty-seven".