1445677561 has 2 divisors, whose sum is σ = 1445677562. Its totient is φ = 1445677560.

The previous prime is 1445677553. The next prime is 1445677609. The reversal of 1445677561 is 1657765441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 945931536 + 499746025 = 30756^2 + 22355^2 .

It is a cyclic number.

It is not a de Polignac number, because 1445677561 - 2³ = 1445677553 is a prime.

It is a super-2 number, since 2×1445677561² = 4179967220757817442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1445677361) 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, 722838780 + 722838781.

It is an arithmetic number, because the mean of its divisors is an integer number (722838781).

Almost surely, 2^1445677561 is an apocalyptic number.

It is an amenable number.

1445677561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1445677561 is an equidigital number, since it uses as much as digits as its factorization.

1445677561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 705600, while the sum is 46.

The square root of 1445677561 is about 38022.0667639201. The cubic root of 1445677561 is about 1130.7253966114.

The spelling of 1445677561 in words is "one billion, four hundred forty-five million, six hundred seventy-seven thousand, five hundred sixty-one".