1645155227 has 2 divisors, whose sum is σ = 1645155228. Its totient is φ = 1645155226.

The previous prime is 1645155221. The next prime is 1645155257. The reversal of 1645155227 is 7225515461.

It is a weak prime.

It is an emirp because it is prime and its reverse (7225515461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1645155227 - 2¹⁴ = 1645138843 is a prime.

It is not a weakly prime, because it can be changed into another prime (1645155221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822577613 + 822577614.

It is an arithmetic number, because the mean of its divisors is an integer number (822577614).

Almost surely, 2^1645155227 is an apocalyptic number.

1645155227 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645155227 is an equidigital number, since it uses as much as digits as its factorization.

1645155227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84000, while the sum is 38.

The square root of 1645155227 is about 40560.5131501070. The cubic root of 1645155227 is about 1180.5080707335.

The spelling of 1645155227 in words is "one billion, six hundred forty-five million, one hundred fifty-five thousand, two hundred twenty-seven".