1445273561 has 2 divisors, whose sum is σ = 1445273562. Its totient is φ = 1445273560.

The previous prime is 1445273527. The next prime is 1445273569. The reversal of 1445273561 is 1653725441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1425515536 + 19758025 = 37756^2 + 4445^2 .

It is an emirp because it is prime and its reverse (1653725441) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1445273561 - 2⁶ = 1445273497 is a prime.

It is a super-2 number, since 2×1445273561² = 4177631332251241442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1445273569) 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, 722636780 + 722636781.

It is an arithmetic number, because the mean of its divisors is an integer number (722636781).

Almost surely, 2^1445273561 is an apocalyptic number.

It is an amenable number.

1445273561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1445273561 is an equidigital number, since it uses as much as digits as its factorization.

1445273561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 38.

The square root of 1445273561 is about 38016.7536883411. The cubic root of 1445273561 is about 1130.6200583184.

The spelling of 1445273561 in words is "one billion, four hundred forty-five million, two hundred seventy-three thousand, five hundred sixty-one".