1445229521 has 2 divisors, whose sum is σ = 1445229522. Its totient is φ = 1445229520.

The previous prime is 1445229451. The next prime is 1445229553. The reversal of 1445229521 is 1259225441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1390469521 + 54760000 = 37289^2 + 7400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1445229521 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1445229571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 722614760 + 722614761.

It is an arithmetic number, because the mean of its divisors is an integer number (722614761).

Almost surely, 2^1445229521 is an apocalyptic number.

1445229521 is the 20321-st centered heptagonal number.

It is an amenable number.

1445229521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1445229521 is an equidigital number, since it uses as much as digits as its factorization.

1445229521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 35.

The square root of 1445229521 is about 38016.1744656140. The cubic root of 1445229521 is about 1130.6085742150.

The spelling of 1445229521 in words is "one billion, four hundred forty-five million, two hundred twenty-nine thousand, five hundred twenty-one".