120831 has 4 divisors (see below), whose sum is σ = 161112. Its totient is φ = 80552.

The previous prime is 120829. The next prime is 120833. The reversal of 120831 is 138021.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (120829) and next prime (120833).

It is a cyclic number.

It is not a de Polignac number, because 120831 - 2¹ = 120829 is a prime.

It is a super-2 number, since 2×120831² = 29200261122, which contains 22 as substring.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 120831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120833) 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, 20136 + ... + 20141.

It is an arithmetic number, because the mean of its divisors is an integer number (40278).

2¹²⁰⁸³¹ is an apocalyptic number.

120831 is a deficient number, since it is larger than the sum of its proper divisors (40281).

120831 is an equidigital number, since it uses as much as digits as its factorization.

120831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40280.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 120831 is about 347.6075373176. The cubic root of 120831 is about 49.4378364644.

Adding to 120831 its reverse (138021), we get a palindrome (258852).

The spelling of 120831 in words is "one hundred twenty thousand, eight hundred thirty-one".