531961 has 4 divisors (see below), whose sum is σ = 542052. Its totient is φ = 521872.

The previous prime is 531919. The next prime is 531977. The reversal of 531961 is 169135.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 169135 = 5 ⋅33827.

It can be written as a sum of positive squares in 2 ways, for example, as 281961 + 250000 = 531^2 + 500^2 .

It is a cyclic number.

It is not a de Polignac number, because 531961 - 2⁷ = 531833 is a prime.

It is an Ulam number.

It is a Duffinian number.

531961 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (531901) 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, 4966 + ... + 5071.

It is an arithmetic number, because the mean of its divisors is an integer number (135513).

2⁵³¹⁹⁶¹ is an apocalyptic number.

It is an amenable number.

531961 is a deficient number, since it is larger than the sum of its proper divisors (10091).

531961 is a wasteful number, since it uses less digits than its factorization.

531961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10090.

The product of its digits is 810, while the sum is 25.

The square root of 531961 is about 729.3565657482. The cubic root of 531961 is about 81.0264101250.

The spelling of 531961 in words is "five hundred thirty-one thousand, nine hundred sixty-one".