1021442249 has 2 divisors, whose sum is σ = 1021442250. Its totient is φ = 1021442248.

The previous prime is 1021442221. The next prime is 1021442251. The reversal of 1021442249 is 9422441201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1018056649 + 3385600 = 31907^2 + 1840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021442249 is a prime.

Together with 1021442251, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1021441249) 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 as a sum of consecutive naturals, namely, 510721124 + 510721125.

It is an arithmetic number, because the mean of its divisors is an integer number (510721125).

Almost surely, 2^1021442249 is an apocalyptic number.

It is an amenable number.

1021442249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021442249 is an equidigital number, since it uses as much as digits as its factorization.

1021442249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 1021442249 is about 31960.0101533150. The cubic root of 1021442249 is about 1007.0969307581.

The spelling of 1021442249 in words is "one billion, twenty-one million, four hundred forty-two thousand, two hundred forty-nine".