971643 has 8 divisors (see below), whose sum is σ = 1304128. Its totient is φ = 643464.

The previous prime is 971639. The next prime is 971651. The reversal of 971643 is 346179.

It is a happy number.

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

It is not a de Polignac number, because 971643 - 2² = 971639 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 971643.

It is not an unprimeable number, because it can be changed into a prime (971653) 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, 505 + ... + 1482.

It is an arithmetic number, because the mean of its divisors is an integer number (163016).

2⁹⁷¹⁶⁴³ is an apocalyptic number.

971643 is a deficient number, since it is larger than the sum of its proper divisors (332485).

971643 is a wasteful number, since it uses less digits than its factorization.

971643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2153.

The product of its digits is 4536, while the sum is 30.

The square root of 971643 is about 985.7195341475. The cubic root of 971643 is about 99.0456885330.

The spelling of 971643 in words is "nine hundred seventy-one thousand, six hundred forty-three".