65431 has 4 divisors (see below), whose sum is σ = 66600. Its totient is φ = 64264.

The previous prime is 65423. The next prime is 65437. The reversal of 65431 is 13456.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65431 - 2³ = 65423 is a prime.

It is a super-2 number, since 2×65431² = 8562431522, which contains 22 as substring.

It is a Duffinian number.

65431 is a lucky number.

It is a nialpdrome in base 10 and base 16.

It is a junction number, because it is equal to n+sod(n) for n = 65399 and 65408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 496 + ... + 613.

It is an arithmetic number, because the mean of its divisors is an integer number (16650).

2⁶⁵⁴³¹ is an apocalyptic number.

65431 is a deficient number, since it is larger than the sum of its proper divisors (1169).

65431 is a wasteful number, since it uses less digits than its factorization.

65431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1168.

The product of its digits is 360, while the sum is 19.

The square root of 65431 is about 255.7948396665. The cubic root of 65431 is about 40.2959302333.

Adding to 65431 its reverse (13456), we get a palindrome (78887).

It can be divided in two parts, 65 and 431, that added together give a triangular number (496 = T₃₁).

The spelling of 65431 in words is "sixty-five thousand, four hundred thirty-one".