142891489 has 4 divisors (see below), whose sum is σ = 153883156. Its totient is φ = 131899824.

The previous prime is 142891481. The next prime is 142891513. The reversal of 142891489 is 984198241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38340864 + 104550625 = 6192^2 + 10225^2 .

It is a cyclic number.

It is not a de Polignac number, because 142891489 - 2³ = 142891481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142891481) 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, 5495814 + ... + 5495839.

It is an arithmetic number, because the mean of its divisors is an integer number (38470789).

Almost surely, 2^142891489 is an apocalyptic number.

It is an amenable number.

142891489 is a deficient number, since it is larger than the sum of its proper divisors (10991667).

142891489 is a wasteful number, since it uses less digits than its factorization.

142891489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10991666.

The product of its digits is 165888, while the sum is 46.

The square root of 142891489 is about 11953.7228092340. The cubic root of 142891489 is about 522.7998495633.

It can be divided in two parts, 142891 and 489, that added together give a triangular number (143380 = T₅₃₅).

The spelling of 142891489 in words is "one hundred forty-two million, eight hundred ninety-one thousand, four hundred eighty-nine".