1142111281 has 2 divisors, whose sum is σ = 1142111282. Its totient is φ = 1142111280.

The previous prime is 1142111251. The next prime is 1142111287. The reversal of 1142111281 is 1821112411.

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., 1083726400 + 58384881 = 32920^2 + 7641^2 .

It is a cyclic number.

It is not a de Polignac number, because 1142111281 - 2⁵ = 1142111249 is a prime.

It is a super-2 number, since 2×1142111281² = 2608836356374921922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1142111287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571055640 + 571055641.

It is an arithmetic number, because the mean of its divisors is an integer number (571055641).

Almost surely, 2^1142111281 is an apocalyptic number.

It is an amenable number.

1142111281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1142111281 is an equidigital number, since it uses as much as digits as its factorization.

1142111281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 128, while the sum is 22.

The square root of 1142111281 is about 33795.1369430574. The cubic root of 1142111281 is about 1045.2884229397.

Adding to 1142111281 its reverse (1821112411), we get a palindrome (2963223692).

The spelling of 1142111281 in words is "one billion, one hundred forty-two million, one hundred eleven thousand, two hundred eighty-one".