531761 has 4 divisors (see below), whose sum is σ = 533232. Its totient is φ = 530292.

The previous prime is 531731. The next prime is 531793. The reversal of 531761 is 167135.

Added to its reverse (167135) it gives a square (698896 = 836²).

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 167135 = 5 ⋅33427.

It is a cyclic number.

It is not a de Polignac number, because 531761 - 2¹⁴ = 515377 is a prime.

It is a super-2 number, since 2×531761² = 565539522242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (531701) 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, 230 + ... + 1056.

It is an arithmetic number, because the mean of its divisors is an integer number (133308).

2⁵³¹⁷⁶¹ is an apocalyptic number.

It is an amenable number.

531761 is a deficient number, since it is larger than the sum of its proper divisors (1471).

531761 is an equidigital number, since it uses as much as digits as its factorization.

531761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470.

The product of its digits is 630, while the sum is 23.

The square root of 531761 is about 729.2194457089. The cubic root of 531761 is about 81.0162544223.

Adding to 531761 its reverse (167135), we get a palindrome (698896).

The spelling of 531761 in words is "five hundred thirty-one thousand, seven hundred sixty-one".