971117843 has 4 divisors (see below), whose sum is σ = 1028242440. Its totient is φ = 913993248.

The previous prime is 971117837. The next prime is 971117881. The reversal of 971117843 is 348711179.

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

It is a cyclic number.

It is not a de Polignac number, because 971117843 - 2⁴ = 971117827 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 971117843.

It is not an unprimeable number, because it can be changed into a prime (971114843) 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, 28562273 + ... + 28562306.

It is an arithmetic number, because the mean of its divisors is an integer number (257060610).

Almost surely, 2^971117843 is an apocalyptic number.

971117843 is a deficient number, since it is larger than the sum of its proper divisors (57124597).

971117843 is a wasteful number, since it uses less digits than its factorization.

971117843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57124596.

The product of its digits is 42336, while the sum is 41.

The square root of 971117843 is about 31162.7637253181. The cubic root of 971117843 is about 990.2784113068.

The spelling of 971117843 in words is "nine hundred seventy-one million, one hundred seventeen thousand, eight hundred forty-three".