142631789 has 4 divisors (see below), whose sum is σ = 142698624. Its totient is φ = 142564956.

The previous prime is 142631779. The next prime is 142631791. The reversal of 142631789 is 987136241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142631789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142631719) 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, 30107 + ... + 34520.

It is an arithmetic number, because the mean of its divisors is an integer number (35674656).

Almost surely, 2^142631789 is an apocalyptic number.

It is an amenable number.

142631789 is a deficient number, since it is larger than the sum of its proper divisors (66835).

142631789 is an equidigital number, since it uses as much as digits as its factorization.

142631789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66834.

The product of its digits is 72576, while the sum is 41.

The square root of 142631789 is about 11942.8551443949. The cubic root of 142631789 is about 522.4829343571.

The spelling of 142631789 in words is "one hundred forty-two million, six hundred thirty-one thousand, seven hundred eighty-nine".