1445251021 has 2 divisors, whose sum is σ = 1445251022. Its totient is φ = 1445251020.

The previous prime is 1445251009. The next prime is 1445251051. The reversal of 1445251021 is 1201525441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 824493796 + 620757225 = 28714^2 + 24915^2 .

It is an emirp because it is prime and its reverse (1201525441) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1445251021 - 2²⁵ = 1411696589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1445251051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 722625510 + 722625511.

It is an arithmetic number, because the mean of its divisors is an integer number (722625511).

Almost surely, 2^1445251021 is an apocalyptic number.

It is an amenable number.

1445251021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1445251021 is an equidigital number, since it uses as much as digits as its factorization.

1445251021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 1445251021 is about 38016.4572389380. The cubic root of 1445251021 is about 1130.6141806979.

Adding to 1445251021 its reverse (1201525441), we get a palindrome (2646776462).

The spelling of 1445251021 in words is "one billion, four hundred forty-five million, two hundred fifty-one thousand, twenty-one".