142664989 has 4 divisors (see below), whose sum is σ = 142698556. Its totient is φ = 142631424.

The previous prime is 142664987. The next prime is 142664993. The reversal of 142664989 is 989466241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 989466241 = 617 ⋅1603673.

It can be written as a sum of positive squares in 2 ways, for example, as 15539364 + 127125625 = 3942^2 + 11275^2 .

It is a cyclic number.

It is not a de Polignac number, because 142664989 - 2¹ = 142664987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142664983) 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 in 3 ways as a sum of consecutive naturals, for example, 9294 + ... + 19279.

It is an arithmetic number, because the mean of its divisors is an integer number (35674639).

Almost surely, 2^142664989 is an apocalyptic number.

It is an amenable number.

142664989 is a deficient number, since it is larger than the sum of its proper divisors (33567).

142664989 is an equidigital number, since it uses as much as digits as its factorization.

142664989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33566.

The product of its digits is 746496, while the sum is 49.

The square root of 142664989 is about 11944.2450159062. The cubic root of 142664989 is about 522.5234701727.

The spelling of 142664989 in words is "one hundred forty-two million, six hundred sixty-four thousand, nine hundred eighty-nine".