1142989621 has 2 divisors, whose sum is σ = 1142989622. Its totient is φ = 1142989620.

The previous prime is 1142989591. The next prime is 1142989657. The reversal of 1142989621 is 1269892411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1009332900 + 133656721 = 31770^2 + 11561^2 .

It is a cyclic number.

It is not a de Polignac number, because 1142989621 - 2²⁵ = 1109435189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1142989691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571494810 + 571494811.

It is an arithmetic number, because the mean of its divisors is an integer number (571494811).

Almost surely, 2^1142989621 is an apocalyptic number.

It is an amenable number.

1142989621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1142989621 is an equidigital number, since it uses as much as digits as its factorization.

1142989621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 43.

The square root of 1142989621 is about 33808.1295105186. The cubic root of 1142989621 is about 1045.5563137573.

The spelling of 1142989621 in words is "one billion, one hundred forty-two million, nine hundred eighty-nine thousand, six hundred twenty-one".