9873567491 has 4 divisors (see below), whose sum is σ = 9876383184. Its totient is φ = 9870751800.

The previous prime is 9873567467. The next prime is 9873567497. The reversal of 9873567491 is 1947653789.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9873567491 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 9873567491.

It is not an unprimeable number, because it can be changed into a prime (9873567497) 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, 1402580 + ... + 1409601.

It is an arithmetic number, because the mean of its divisors is an integer number (2469095796).

Almost surely, 2^9873567491 is an apocalyptic number.

9873567491 is a deficient number, since it is larger than the sum of its proper divisors (2815693).

9873567491 is a wasteful number, since it uses less digits than its factorization.

9873567491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2815692.

The product of its digits is 11430720, while the sum is 59.

The square root of 9873567491 is about 99365.8265753373. The cubic root of 9873567491 is about 2145.3164672722.

The spelling of 9873567491 in words is "nine billion, eight hundred seventy-three million, five hundred sixty-seven thousand, four hundred ninety-one".