971391192 has 128 divisors (see below), whose sum is σ = 2623276800. Its totient is φ = 299109888.

The previous prime is 971391191. The next prime is 971391193. The reversal of 971391192 is 291193179.

It is an interprime number because it is at equal distance from previous prime (971391191) and next prime (971391193).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (971391191) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1725103 + ... + 1725665.

It is an arithmetic number, because the mean of its divisors is an integer number (20494350).

Almost surely, 2^971391192 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 971391192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1311638400).

971391192 is an abundant number, since it is smaller than the sum of its proper divisors (1651885608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

971391192 is a wasteful number, since it uses less digits than its factorization.

971391192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705 (or 701 counting only the distinct ones).

The product of its digits is 30618, while the sum is 42.

The square root of 971391192 is about 31167.1492440358. The cubic root of 971391192 is about 990.3713166877.

The spelling of 971391192 in words is "nine hundred seventy-one million, three hundred ninety-one thousand, one hundred ninety-two".