1445221231 has 2 divisors, whose sum is σ = 1445221232. Its totient is φ = 1445221230.

The previous prime is 1445221229. The next prime is 1445221273. The reversal of 1445221231 is 1321225441.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1445221231 - 2¹ = 1445221229 is a prime.

It is a super-2 number, since 2×1445221231² = 4177328813066310722, which contains 22 as substring.

Together with 1445221229, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1445221196 and 1445221205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1443221231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 722610615 + 722610616.

It is an arithmetic number, because the mean of its divisors is an integer number (722610616).

Almost surely, 2^1445221231 is an apocalyptic number.

1445221231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1445221231 is an equidigital number, since it uses as much as digits as its factorization.

1445221231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 25.

The square root of 1445221231 is about 38016.0654329193. The cubic root of 1445221231 is about 1130.6064124447.

Adding to 1445221231 its reverse (1321225441), we get a palindrome (2766446672).

The spelling of 1445221231 in words is "one billion, four hundred forty-five million, two hundred twenty-one thousand, two hundred thirty-one".