142281781 has 4 divisors (see below), whose sum is σ = 142343872. Its totient is φ = 142219692.

The previous prime is 142281773. The next prime is 142281787. The reversal of 142281781 is 187182241.

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: 187182241 = 359 ⋅521399.

It is a cyclic number.

It is not a de Polignac number, because 142281781 - 2³ = 142281773 is a prime.

It is a super-2 number, since 2×142281781² = 40488210409063922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142281787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27471 + ... + 32236.

It is an arithmetic number, because the mean of its divisors is an integer number (35585968).

Almost surely, 2^142281781 is an apocalyptic number.

It is an amenable number.

142281781 is a deficient number, since it is larger than the sum of its proper divisors (62091).

142281781 is an equidigital number, since it uses as much as digits as its factorization.

142281781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62090.

The product of its digits is 7168, while the sum is 34.

The square root of 142281781 is about 11928.1926962973. The cubic root of 142281781 is about 522.0552059658.

The spelling of 142281781 in words is "one hundred forty-two million, two hundred eighty-one thousand, seven hundred eighty-one".