1445221252 has 6 divisors (see below), whose sum is σ = 2529137198. Its totient is φ = 722610624.

The previous prime is 1445221231. The next prime is 1445221273. The reversal of 1445221252 is 2521225441.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1445221231) and next prime (1445221273).

It can be written as a sum of positive squares in only one way, i.e., 1439140096 + 6081156 = 37936^2 + 2466^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1445221252.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180652653 + ... + 180652660.

Almost surely, 2^1445221252 is an apocalyptic number.

It is an amenable number.

1445221252 is a deficient number, since it is larger than the sum of its proper divisors (1083915946).

1445221252 is a wasteful number, since it uses less digits than its factorization.

1445221252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361305317 (or 361305315 counting only the distinct ones).

The product of its digits is 6400, while the sum is 28.

The square root of 1445221252 is about 38016.0657091183. The cubic root of 1445221252 is about 1130.6064179208.

Adding to 1445221252 its reverse (2521225441), we get a palindrome (3966446693).

The spelling of 1445221252 in words is "one billion, four hundred forty-five million, two hundred twenty-one thousand, two hundred fifty-two".