142455421 has 2 divisors, whose sum is σ = 142455422. Its totient is φ = 142455420.

The previous prime is 142455419. The next prime is 142455433. The reversal of 142455421 is 124554241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72080100 + 70375321 = 8490^2 + 8389^2 .

It is a cyclic number.

It is not a de Polignac number, because 142455421 - 2¹ = 142455419 is a prime.

Together with 142455419, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 142455421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142455451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71227710 + 71227711.

It is an arithmetic number, because the mean of its divisors is an integer number (71227711).

Almost surely, 2^142455421 is an apocalyptic number.

It is an amenable number.

142455421 is a deficient number, since it is larger than the sum of its proper divisors (1).

142455421 is an equidigital number, since it uses as much as digits as its factorization.

142455421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6400, while the sum is 28.

The square root of 142455421 is about 11935.4690314206. The cubic root of 142455421 is about 522.2674908514.

The spelling of 142455421 in words is "one hundred forty-two million, four hundred fifty-five thousand, four hundred twenty-one".