971243520 has 304 divisors, whose sum is σ = 3523208640. Its totient is φ = 226492416.

The previous prime is 971243513. The next prime is 971243521. The reversal of 971243520 is 25342179.

It is a tau number, because it is divible by the number of its divisors (304).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (971243521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51118071 + ... + 51118089.

Almost surely, 2^971243520 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 971243520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1761604320).

971243520 is an abundant number, since it is smaller than the sum of its proper divisors (2551965120).

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

971243520 is an equidigital number, since it uses as much as digits as its factorization.

971243520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76 (or 42 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 971243520 is about 31164.7801211560. The cubic root of 971243520 is about 990.3211283510.

Adding to 971243520 its reverse (25342179), we get a palindrome (996585699).

The spelling of 971243520 in words is "nine hundred seventy-one million, two hundred forty-three thousand, five hundred twenty".