142837781 has 2 divisors, whose sum is σ = 142837782. Its totient is φ = 142837780.

The previous prime is 142837733. The next prime is 142837813. The reversal of 142837781 is 187738241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102718225 + 40119556 = 10135^2 + 6334^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142837781 is a prime.

It is a super-2 number, since 2×142837781² = 40805263362007922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142837381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71418890 + 71418891.

It is an arithmetic number, because the mean of its divisors is an integer number (71418891).

Almost surely, 2^142837781 is an apocalyptic number.

It is an amenable number.

142837781 is a deficient number, since it is larger than the sum of its proper divisors (1).

142837781 is an equidigital number, since it uses as much as digits as its factorization.

142837781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75264, while the sum is 41.

The square root of 142837781 is about 11951.4761013023. The cubic root of 142837781 is about 522.7343405229.

The spelling of 142837781 in words is "one hundred forty-two million, eight hundred thirty-seven thousand, seven hundred eighty-one".