142285721 has 2 divisors, whose sum is σ = 142285722. Its totient is φ = 142285720.

The previous prime is 142285681. The next prime is 142285727. The reversal of 142285721 is 127582241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71910400 + 70375321 = 8480^2 + 8389^2 .

It is a cyclic number.

It is not a de Polignac number, because 142285721 - 2¹⁸ = 142023577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (142285727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71142860 + 71142861.

It is an arithmetic number, because the mean of its divisors is an integer number (71142861).

Almost surely, 2^142285721 is an apocalyptic number.

It is an amenable number.

142285721 is a deficient number, since it is larger than the sum of its proper divisors (1).

142285721 is an equidigital number, since it uses as much as digits as its factorization.

142285721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 32.

The square root of 142285721 is about 11928.3578500982. The cubic root of 142285721 is about 522.0600247568.

The spelling of 142285721 in words is "one hundred forty-two million, two hundred eighty-five thousand, seven hundred twenty-one".