1045249921 has 2 divisors, whose sum is σ = 1045249922. Its totient is φ = 1045249920.

The previous prime is 1045249897. The next prime is 1045249957. The reversal of 1045249921 is 1299425401.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 952339600 + 92910321 = 30860^2 + 9639^2 .

It is an emirp because it is prime and its reverse (1299425401) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1045249921 - 2⁹ = 1045249409 is a prime.

It is not a weakly prime, because it can be changed into another prime (1045249991) 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, 522624960 + 522624961.

It is an arithmetic number, because the mean of its divisors is an integer number (522624961).

Almost surely, 2^1045249921 is an apocalyptic number.

It is an amenable number.

1045249921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1045249921 is an equidigital number, since it uses as much as digits as its factorization.

1045249921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 1045249921 is about 32330.3250988913. The cubic root of 1045249921 is about 1014.8613530924.

The spelling of 1045249921 in words is "one billion, forty-five million, two hundred forty-nine thousand, nine hundred twenty-one".