971638287 has 8 divisors (see below), whose sum is σ = 1295701680. Its totient is φ = 647666880.

The previous prime is 971638271. The next prime is 971638351. The reversal of 971638287 is 782836179.

971638287 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 971638287 - 2⁴ = 971638271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (971638237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7389 + ... + 44697.

It is an arithmetic number, because the mean of its divisors is an integer number (161962710).

Almost surely, 2^971638287 is an apocalyptic number.

971638287 is a deficient number, since it is larger than the sum of its proper divisors (324063393).

971638287 is a wasteful number, since it uses less digits than its factorization.

971638287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45993.

The product of its digits is 1016064, while the sum is 51.

The square root of 971638287 is about 31171.1130215140. The cubic root of 971638287 is about 990.4552839077.

The spelling of 971638287 in words is "nine hundred seventy-one million, six hundred thirty-eight thousand, two hundred eighty-seven".