1645342211 has 4 divisors (see below), whose sum is σ = 1647773232. Its totient is φ = 1642911192.

The previous prime is 1645342201. The next prime is 1645342213. The reversal of 1645342211 is 1122435461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1122435461 = 7 ⋅160347923.

It is a cyclic number.

It is not a de Polignac number, because 1645342211 - 2⁶ = 1645342147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1645342213) 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 in 3 ways as a sum of consecutive naturals, for example, 1214495 + ... + 1215848.

It is an arithmetic number, because the mean of its divisors is an integer number (411943308).

Almost surely, 2^1645342211 is an apocalyptic number.

1645342211 is a deficient number, since it is larger than the sum of its proper divisors (2431021).

1645342211 is an equidigital number, since it uses as much as digits as its factorization.

1645342211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2431020.

The product of its digits is 5760, while the sum is 29.

The square root of 1645342211 is about 40562.8180850394. The cubic root of 1645342211 is about 1180.5527935161.

Adding to 1645342211 its reverse (1122435461), we get a palindrome (2767777672).

The spelling of 1645342211 in words is "one billion, six hundred forty-five million, three hundred forty-two thousand, two hundred eleven".