142781081 has 2 divisors, whose sum is σ = 142781082. Its totient is φ = 142781080.

The previous prime is 142781063. The next prime is 142781083. The reversal of 142781081 is 180187241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142587481 + 193600 = 11941^2 + 440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142781081 is a prime.

It is a super-2 number, since 2×142781081² = 40772874183057122, which contains 22 as substring.

Together with 142781083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (142781083) 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 as a sum of consecutive naturals, namely, 71390540 + 71390541.

It is an arithmetic number, because the mean of its divisors is an integer number (71390541).

Almost surely, 2^142781081 is an apocalyptic number.

It is an amenable number.

142781081 is a deficient number, since it is larger than the sum of its proper divisors (1).

142781081 is an equidigital number, since it uses as much as digits as its factorization.

142781081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 32.

The square root of 142781081 is about 11949.1037739238. The cubic root of 142781081 is about 522.6651642411.

The spelling of 142781081 in words is "one hundred forty-two million, seven hundred eighty-one thousand, eighty-one".