142811789 has 2 divisors, whose sum is σ = 142811790. Its totient is φ = 142811788.

The previous prime is 142811777. The next prime is 142811791. The reversal of 142811789 is 987118241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131285764 + 11526025 = 11458^2 + 3395^2 .

It is an emirp because it is prime and its reverse (987118241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142811789 - 2⁸ = 142811533 is a prime.

Together with 142811791, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142811719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71405894 + 71405895.

It is an arithmetic number, because the mean of its divisors is an integer number (71405895).

Almost surely, 2^142811789 is an apocalyptic number.

It is an amenable number.

142811789 is a deficient number, since it is larger than the sum of its proper divisors (1).

142811789 is an equidigital number, since it uses as much as digits as its factorization.

142811789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 41.

The square root of 142811789 is about 11950.3886547677. The cubic root of 142811789 is about 522.7026315098.

The spelling of 142811789 in words is "one hundred forty-two million, eight hundred eleven thousand, seven hundred eighty-nine".