65831 has 2 divisors, whose sum is σ = 65832. Its totient is φ = 65830.

The previous prime is 65827. The next prime is 65837. The reversal of 65831 is 13856.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65831 - 2² = 65827 is a prime.

It is a super-2 number, since 2×65831² = 8667441122, which contains 22 as substring.

It is a Chen prime.

It is equal to p₆₅₇₅ and since 65831 and 6575 have the same sum of digits, it is a Honaker prime.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 65797 and 65806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32915 + 32916.

It is an arithmetic number, because the mean of its divisors is an integer number (32916).

2⁶⁵⁸³¹ is an apocalyptic number.

65831 is a deficient number, since it is larger than the sum of its proper divisors (1).

65831 is an equidigital number, since it uses as much as digits as its factorization.

65831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 23.

The square root of 65831 is about 256.5755249434. The cubic root of 65831 is about 40.3778773106.

The spelling of 65831 in words is "sixty-five thousand, eight hundred thirty-one".