1142881821 has 12 divisors (see below), whose sum is σ = 1689221248. Its totient is φ = 744201864.

The previous prime is 1142881819. The next prime is 1142881823. The reversal of 1142881821 is 1281882411.

It is an interprime number because it is at equal distance from previous prime (1142881819) and next prime (1142881823).

It is not a de Polignac number, because 1142881821 - 2¹ = 1142881819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1142881823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1476205 + ... + 1476978.

Almost surely, 2^1142881821 is an apocalyptic number.

It is an amenable number.

1142881821 is a deficient number, since it is larger than the sum of its proper divisors (546339427).

1142881821 is a wasteful number, since it uses less digits than its factorization.

1142881821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2953232 (or 2953229 counting only the distinct ones).

The product of its digits is 8192, while the sum is 36.

The square root of 1142881821 is about 33806.5351818254. The cubic root of 1142881821 is about 1045.5234425010.

The spelling of 1142881821 in words is "one billion, one hundred forty-two million, eight hundred eighty-one thousand, eight hundred twenty-one".