142748821 has 2 divisors, whose sum is σ = 142748822. Its totient is φ = 142748820.

The previous prime is 142748747. The next prime is 142748857. The reversal of 142748821 is 128847241.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119574225 + 23174596 = 10935^2 + 4814^2 .

It is an emirp because it is prime and its reverse (128847241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142748821 - 2⁷ = 142748693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142748861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71374410 + 71374411.

It is an arithmetic number, because the mean of its divisors is an integer number (71374411).

Almost surely, 2^142748821 is an apocalyptic number.

It is an amenable number.

142748821 is a deficient number, since it is larger than the sum of its proper divisors (1).

142748821 is an equidigital number, since it uses as much as digits as its factorization.

142748821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28672, while the sum is 37.

The square root of 142748821 is about 11947.7538056323. The cubic root of 142748821 is about 522.6257975685.

The spelling of 142748821 in words is "one hundred forty-two million, seven hundred forty-eight thousand, eight hundred twenty-one".