971539 has 4 divisors (see below), whose sum is σ = 975256. Its totient is φ = 967824.

The previous prime is 971521. The next prime is 971549. The reversal of 971539 is 935179.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 935179 = 7 ⋅133597.

It is a cyclic number.

It is not a de Polignac number, because 971539 - 2⁹ = 971027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (971549) 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, 1434 + ... + 1999.

It is an arithmetic number, because the mean of its divisors is an integer number (243814).

2⁹⁷¹⁵³⁹ is an apocalyptic number.

971539 is a deficient number, since it is larger than the sum of its proper divisors (3717).

971539 is a wasteful number, since it uses less digits than its factorization.

971539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3716.

The product of its digits is 8505, while the sum is 34.

The square root of 971539 is about 985.6667793935. Note that the first 3 decimals coincide. The cubic root of 971539 is about 99.0421546153.

It can be divided in two parts, 9715 and 39, that multiplied together give a triangular number (378885 = T₈₇₀).

The spelling of 971539 in words is "nine hundred seventy-one thousand, five hundred thirty-nine".