1142309981 has 2 divisors, whose sum is σ = 1142309982. Its totient is φ = 1142309980.

The previous prime is 1142309977. The next prime is 1142310011. The reversal of 1142309981 is 1899032411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1096205881 + 46104100 = 33109^2 + 6790^2 .

It is an emirp because it is prime and its reverse (1899032411) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1142309981 - 2² = 1142309977 is a prime.

It is a super-2 number, since 2×1142309981² = 2609744185384440722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1142309911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571154990 + 571154991.

It is an arithmetic number, because the mean of its divisors is an integer number (571154991).

Almost surely, 2^1142309981 is an apocalyptic number.

It is an amenable number.

1142309981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1142309981 is an equidigital number, since it uses as much as digits as its factorization.

1142309981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 1142309981 is about 33798.0765872853. The cubic root of 1142309981 is about 1045.3490378055.

The spelling of 1142309981 in words is "one billion, one hundred forty-two million, three hundred nine thousand, nine hundred eighty-one".