142787221 has 2 divisors, whose sum is σ = 142787222. Its totient is φ = 142787220.

The previous prime is 142787189. The next prime is 142787231. The reversal of 142787221 is 122787241.

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., 126675025 + 16112196 = 11255^2 + 4014^2 .

It is a cyclic number.

It is not a de Polignac number, because 142787221 - 2⁵ = 142787189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142787231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71393610 + 71393611.

It is an arithmetic number, because the mean of its divisors is an integer number (71393611).

Almost surely, 2^142787221 is an apocalyptic number.

It is an amenable number.

142787221 is a deficient number, since it is larger than the sum of its proper divisors (1).

142787221 is an equidigital number, since it uses as much as digits as its factorization.

142787221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12544, while the sum is 34.

The square root of 142787221 is about 11949.3606941962. The cubic root of 142787221 is about 522.6726561723.

The spelling of 142787221 in words is "one hundred forty-two million, seven hundred eighty-seven thousand, two hundred twenty-one".