66031 has 4 divisors (see below), whose sum is σ = 75472. Its totient is φ = 56592.

The previous prime is 66029. The next prime is 66037. The reversal of 66031 is 13066.

It is a happy number.

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 66031 - 2¹ = 66029 is a prime.

It is a super-2 number, since 2×66031² = 8720185922, which contains 22 as substring.

It is a Duffinian number.

66031 is a lucky number.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 65996 and 66014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66037) 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, 4710 + ... + 4723.

It is an arithmetic number, because the mean of its divisors is an integer number (18868).

2⁶⁶⁰³¹ is an apocalyptic number.

66031 is a deficient number, since it is larger than the sum of its proper divisors (9441).

66031 is an equidigital number, since it uses as much as digits as its factorization.

66031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9440.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 66031 is about 256.9649781585. The cubic root of 66031 is about 40.4187264098.

Adding to 66031 its reverse (13066), we get a palindrome (79097).

The spelling of 66031 in words is "sixty-six thousand, thirty-one".