1445505421 has 2 divisors, whose sum is σ = 1445505422. Its totient is φ = 1445505420.

The previous prime is 1445505331. The next prime is 1445505433. The reversal of 1445505421 is 1245055441.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1435652100 + 9853321 = 37890^2 + 3139^2 .

It is a cyclic number.

It is not a de Polignac number, because 1445505421 - 2⁹ = 1445504909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1445505521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 722752710 + 722752711.

It is an arithmetic number, because the mean of its divisors is an integer number (722752711).

Almost surely, 2^1445505421 is an apocalyptic number.

It is an amenable number.

1445505421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1445505421 is an equidigital number, since it uses as much as digits as its factorization.

1445505421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16000, while the sum is 31.

The square root of 1445505421 is about 38019.8030110625. The cubic root of 1445505421 is about 1130.6805155118.

The spelling of 1445505421 in words is "one billion, four hundred forty-five million, five hundred five thousand, four hundred twenty-one".