142231121 has 2 divisors, whose sum is σ = 142231122. Its totient is φ = 142231120.

The previous prime is 142231097. The next prime is 142231181. The reversal of 142231121 is 121132241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74580496 + 67650625 = 8636^2 + 8225^2 .

It is an emirp because it is prime and its reverse (121132241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142231121 - 2¹⁰ = 142230097 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 142231121.

It is not a weakly prime, because it can be changed into another prime (142231181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71115560 + 71115561.

It is an arithmetic number, because the mean of its divisors is an integer number (71115561).

Almost surely, 2^142231121 is an apocalyptic number.

It is an amenable number.

142231121 is a deficient number, since it is larger than the sum of its proper divisors (1).

142231121 is an equidigital number, since it uses as much as digits as its factorization.

142231121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 17.

The square root of 142231121 is about 11926.0689667635. The cubic root of 142231121 is about 521.9932386592.

Adding to 142231121 its reverse (121132241), we get a palindrome (263363362).

The spelling of 142231121 in words is "one hundred forty-two million, two hundred thirty-one thousand, one hundred twenty-one".