142659991 has 2 divisors, whose sum is σ = 142659992. Its totient is φ = 142659990.

The previous prime is 142659983. The next prime is 142660061. The reversal of 142659991 is 199956241.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (199956241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142659991 - 2³ = 142659983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142659911) 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, 71329995 + 71329996.

It is an arithmetic number, because the mean of its divisors is an integer number (71329996).

Almost surely, 2^142659991 is an apocalyptic number.

142659991 is a deficient number, since it is larger than the sum of its proper divisors (1).

142659991 is an equidigital number, since it uses as much as digits as its factorization.

142659991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 46.

The square root of 142659991 is about 11944.0357919758. The cubic root of 142659991 is about 522.5173682253.

The spelling of 142659991 in words is "one hundred forty-two million, six hundred fifty-nine thousand, nine hundred ninety-one".