142781 has 4 divisors (see below), whose sum is σ = 144864. Its totient is φ = 140700.

The previous prime is 142771. The next prime is 142787. The reversal of 142781 is 187241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 187241 = 113 ⋅1657.

It is a cyclic number.

It is not a de Polignac number, because 142781 - 2¹⁴ = 126397 is a prime.

It is a super-2 number, since 2×142781² = 40772827922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 142781.

It is not an unprimeable number, because it can be changed into a prime (142787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 935 + ... + 1076.

It is an arithmetic number, because the mean of its divisors is an integer number (36216).

2¹⁴²⁷⁸¹ is an apocalyptic number.

It is an amenable number.

142781 is a deficient number, since it is larger than the sum of its proper divisors (2083).

142781 is an equidigital number, since it uses as much as digits as its factorization.

142781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2082.

The product of its digits is 448, while the sum is 23.

The square root of 142781 is about 377.8637320516. The cubic root of 142781 is about 52.2665065405.

The spelling of 142781 in words is "one hundred forty-two thousand, seven hundred eighty-one".