1445948917921 has 2 divisors, whose sum is σ = 1445948917922. Its totient is φ = 1445948917920.

The previous prime is 1445948917867. The next prime is 1445948917967. The reversal of 1445948917921 is 1297198495441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1334082750625 + 111866167296 = 1155025^2 + 334464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1445948917921 is a prime.

It is not a weakly prime, because it can be changed into another prime (1445948917981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 722974458960 + 722974458961.

It is an arithmetic number, because the mean of its divisors is an integer number (722974458961).

Almost surely, 2^{1445948917921} is an apocalyptic number.

It is an amenable number.

1445948917921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1445948917921 is an equidigital number, since it uses as much as digits as its factorization.

1445948917921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26127360, while the sum is 64.

The spelling of 1445948917921 in words is "one trillion, four hundred forty-five billion, nine hundred forty-eight million, nine hundred seventeen thousand, nine hundred twenty-one".