9971072549 has 4 divisors (see below), whose sum is σ = 9981384864. Its totient is φ = 9960760236.

The previous prime is 9971072533. The next prime is 9971072557. The reversal of 9971072549 is 9452701799.

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 9971072549 - 2⁴ = 9971072533 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 9971072549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9971072519) 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, 5154707 + ... + 5156640.

It is an arithmetic number, because the mean of its divisors is an integer number (2495346216).

Almost surely, 2^9971072549 is an apocalyptic number.

It is an amenable number.

9971072549 is a deficient number, since it is larger than the sum of its proper divisors (10312315).

9971072549 is a wasteful number, since it uses less digits than its factorization.

9971072549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10312314.

The product of its (nonzero) digits is 1428840, while the sum is 53.

The square root of 9971072549 is about 99855.2579937581. The cubic root of 9971072549 is about 2152.3552735362.

The spelling of 9971072549 in words is "nine billion, nine hundred seventy-one million, seventy-two thousand, five hundred forty-nine".