971511975 has 90 divisors (see below), whose sum is σ = 2093598144. Its totient is φ = 444074400.

The previous prime is 971511913. The next prime is 971511991. The reversal of 971511975 is 579115179.

It is a happy number.

971511975 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 971511975 - 2⁶ = 971511911 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 971511975.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 94330 + ... + 104120.

Almost surely, 2^971511975 is an apocalyptic number.

971511975 is an abundant number, since it is smaller than the sum of its proper divisors (1122086169).

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

971511975 is a wasteful number, since it uses less digits than its factorization.

971511975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9827 (or 9806 counting only the distinct ones).

The product of its digits is 99225, while the sum is 45.

The square root of 971511975 is about 31169.0868489919. The cubic root of 971511975 is about 990.4123626509.

The spelling of 971511975 in words is "nine hundred seventy-one million, five hundred eleven thousand, nine hundred seventy-five".