971391 has 4 divisors (see below), whose sum is σ = 1295192. Its totient is φ = 647592.

The previous prime is 971389. The next prime is 971401. The reversal of 971391 is 193179.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 971391 - 2¹ = 971389 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (971371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161896 + ... + 161901.

It is an arithmetic number, because the mean of its divisors is an integer number (323798).

2⁹⁷¹³⁹¹ is an apocalyptic number.

971391 is a deficient number, since it is larger than the sum of its proper divisors (323801).

971391 is a wasteful number, since it uses less digits than its factorization.

971391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323800.

The product of its digits is 1701, while the sum is 30.

The square root of 971391 is about 985.5917004521. The cubic root of 971391 is about 99.0371251437.

The spelling of 971391 in words is "nine hundred seventy-one thousand, three hundred ninety-one".