1645011223 has 2 divisors, whose sum is σ = 1645011224. Its totient is φ = 1645011222.

The previous prime is 1645011211. The next prime is 1645011227. The reversal of 1645011223 is 3221105461.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1645011223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1645011227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822505611 + 822505612.

It is an arithmetic number, because the mean of its divisors is an integer number (822505612).

Almost surely, 2^1645011223 is an apocalyptic number.

1645011223 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645011223 is an equidigital number, since it uses as much as digits as its factorization.

1645011223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1645011223 is about 40558.7379364792. The cubic root of 1645011223 is about 1180.4736255857.

Adding to 1645011223 its reverse (3221105461), we get a palindrome (4866116684).

The spelling of 1645011223 in words is "one billion, six hundred forty-five million, eleven thousand, two hundred twenty-three".