971531 has 4 divisors (see below), whose sum is σ = 1059864. Its totient is φ = 883200.

The previous prime is 971521. The next prime is 971549. The reversal of 971531 is 135179.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135179 = 11 ⋅12289.

It is a cyclic number.

It is not a de Polignac number, because 971531 - 2¹⁴ = 955147 is a prime.

It is a super-2 number, since 2×971531² = 1887744967922, which contains 22 as substring.

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 971531.

It is not an unprimeable number, because it can be changed into a prime (971501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44150 + ... + 44171.

It is an arithmetic number, because the mean of its divisors is an integer number (264966).

2⁹⁷¹⁵³¹ is an apocalyptic number.

971531 is a deficient number, since it is larger than the sum of its proper divisors (88333).

971531 is a wasteful number, since it uses less digits than its factorization.

971531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88332.

The product of its digits is 945, while the sum is 26.

The square root of 971531 is about 985.6627212186. The cubic root of 971531 is about 99.0418827650.

The spelling of 971531 in words is "nine hundred seventy-one thousand, five hundred thirty-one".