142290721 has 2 divisors, whose sum is σ = 142290722. Its totient is φ = 142290720.

The previous prime is 142290649. The next prime is 142290737. The reversal of 142290721 is 127092241.

142290721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110481121 + 31809600 = 10511^2 + 5640^2 .

It is a cyclic number.

It is not a de Polignac number, because 142290721 - 2⁹ = 142290209 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 142290721.

It is not a weakly prime, because it can be changed into another prime (142290751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71145360 + 71145361.

It is an arithmetic number, because the mean of its divisors is an integer number (71145361).

Almost surely, 2^142290721 is an apocalyptic number.

It is an amenable number.

142290721 is a deficient number, since it is larger than the sum of its proper divisors (1).

142290721 is an equidigital number, since it uses as much as digits as its factorization.

142290721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 142290721 is about 11928.5674328479. The cubic root of 142290721 is about 522.0661398459.

The spelling of 142290721 in words is "one hundred forty-two million, two hundred ninety thousand, seven hundred twenty-one".