142143551 has 4 divisors (see below), whose sum is σ = 155065704. Its totient is φ = 129221400.

The previous prime is 142143539. The next prime is 142143581. The reversal of 142143551 is 155341241.

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

It is a de Polignac number, because none of the positive numbers 2^k-142143551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 142143551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142143581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6461060 + ... + 6461081.

It is an arithmetic number, because the mean of its divisors is an integer number (38766426).

Almost surely, 2^142143551 is an apocalyptic number.

142143551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

142143551 is a deficient number, since it is larger than the sum of its proper divisors (12922153).

142143551 is a wasteful number, since it uses less digits than its factorization.

142143551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12922152.

The product of its digits is 2400, while the sum is 26.

The square root of 142143551 is about 11922.3970324763. The cubic root of 142143551 is about 521.8860883346.

Adding to 142143551 its reverse (155341241), we get a palindrome (297484792).

The spelling of 142143551 in words is "one hundred forty-two million, one hundred forty-three thousand, five hundred fifty-one".