142251551 has 4 divisors (see below), whose sum is σ = 153193992. Its totient is φ = 131309112.

The previous prime is 142251541. The next prime is 142251559. The reversal of 142251551 is 155152241.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142251551 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 142251551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142251559) 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, 5471201 + ... + 5471226.

It is an arithmetic number, because the mean of its divisors is an integer number (38298498).

Almost surely, 2^142251551 is an apocalyptic number.

142251551 is a deficient number, since it is larger than the sum of its proper divisors (10942441).

142251551 is a wasteful number, since it uses less digits than its factorization.

142251551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10942440.

The product of its digits is 2000, while the sum is 26.

The square root of 142251551 is about 11926.9254630018. The cubic root of 142251551 is about 522.0182304032.

The spelling of 142251551 in words is "one hundred forty-two million, two hundred fifty-one thousand, five hundred fifty-one".