1020145649 has 2 divisors, whose sum is σ = 1020145650. Its totient is φ = 1020145648.

The previous prime is 1020145591. The next prime is 1020145667. The reversal of 1020145649 is 9465410201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 932386225 + 87759424 = 30535^2 + 9368^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020145649 - 2¹² = 1020141553 is a prime.

It is not a weakly prime, because it can be changed into another prime (1020145699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510072824 + 510072825.

It is an arithmetic number, because the mean of its divisors is an integer number (510072825).

Almost surely, 2^1020145649 is an apocalyptic number.

It is an amenable number.

1020145649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020145649 is an equidigital number, since it uses as much as digits as its factorization.

1020145649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1020145649 is about 31939.7189874927. The cubic root of 1020145649 is about 1006.6706202180.

The spelling of 1020145649 in words is "one billion, twenty million, one hundred forty-five thousand, six hundred forty-nine".