142931 has 4 divisors (see below), whose sum is σ = 146832. Its totient is φ = 139032.

The previous prime is 142907. The next prime is 142939. The reversal of 142931 is 139241.

142931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 142931 - 2⁶ = 142867 is a prime.

It is a super-2 number, since 2×142931² = 40858541522, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 142931.

It is not an unprimeable number, because it can be changed into a prime (142939) 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, 1895 + ... + 1968.

It is an arithmetic number, because the mean of its divisors is an integer number (36708).

2¹⁴²⁹³¹ is an apocalyptic number.

142931 is a deficient number, since it is larger than the sum of its proper divisors (3901).

142931 is an equidigital number, since it uses as much as digits as its factorization.

142931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3900.

The product of its digits is 216, while the sum is 20.

The square root of 142931 is about 378.0621642005. The cubic root of 142931 is about 52.2848031675.

The spelling of 142931 in words is "one hundred forty-two thousand, nine hundred thirty-one".