971231 has 4 divisors (see below), whose sum is σ = 973272. Its totient is φ = 969192.

The previous prime is 971207. The next prime is 971237. The reversal of 971231 is 132179.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132179 = 131 ⋅1009.

It is a cyclic number.

It is not a de Polignac number, because 971231 - 2¹⁴ = 954847 is a prime.

It is a super-2 number, since 2×971231² = 1886579310722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 971197 and 971206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (971237) 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, 116 + ... + 1398.

It is an arithmetic number, because the mean of its divisors is an integer number (243318).

2⁹⁷¹²³¹ is an apocalyptic number.

971231 is a deficient number, since it is larger than the sum of its proper divisors (2041).

971231 is a wasteful number, since it uses less digits than its factorization.

971231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040.

The product of its digits is 378, while the sum is 23.

The square root of 971231 is about 985.5105275947. The cubic root of 971231 is about 99.0316873025.

The spelling of 971231 in words is "nine hundred seventy-one thousand, two hundred thirty-one".