142891999 has 2 divisors, whose sum is σ = 142892000. Its totient is φ = 142891998.

The previous prime is 142891997. The next prime is 142892083. The reversal of 142891999 is 999198241.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 142891999 - 2¹ = 142891997 is a prime.

Together with 142891997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142891997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71445999 + 71446000.

It is an arithmetic number, because the mean of its divisors is an integer number (71446000).

Almost surely, 2^142891999 is an apocalyptic number.

142891999 is a deficient number, since it is larger than the sum of its proper divisors (1).

142891999 is an equidigital number, since it uses as much as digits as its factorization.

142891999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 52.

The square root of 142891999 is about 11953.7441414814. The cubic root of 142891999 is about 522.8004715448.

The spelling of 142891999 in words is "one hundred forty-two million, eight hundred ninety-one thousand, nine hundred ninety-nine".