1445668691 has 2 divisors, whose sum is σ = 1445668692. Its totient is φ = 1445668690.

The previous prime is 1445668687. The next prime is 1445668711. The reversal of 1445668691 is 1968665441.

It is a weak prime.

It is an emirp because it is prime and its reverse (1968665441) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1445668691 - 2² = 1445668687 is a prime.

It is not a weakly prime, because it can be changed into another prime (1445668621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 722834345 + 722834346.

It is an arithmetic number, because the mean of its divisors is an integer number (722834346).

Almost surely, 2^1445668691 is an apocalyptic number.

1445668691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1445668691 is an equidigital number, since it uses as much as digits as its factorization.

1445668691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 50.

The square root of 1445668691 is about 38021.9501209499. The cubic root of 1445668691 is about 1130.7230840730.

The spelling of 1445668691 in words is "one billion, four hundred forty-five million, six hundred sixty-eight thousand, six hundred ninety-one".