1545221105 has 4 divisors (see below), whose sum is σ = 1854265332. Its totient is φ = 1236176880.

The previous prime is 1545221089. The next prime is 1545221159. The reversal of 1545221105 is 5011225451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5011225451 = 41 ⋅122225011.

It can be written as a sum of positive squares in 2 ways, for example, as 742235536 + 802985569 = 27244^2 + 28337^2 .

It is not a de Polignac number, because 1545221105 - 2⁴ = 1545221089 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154522106 + ... + 154522115.

It is an arithmetic number, because the mean of its divisors is an integer number (463566333).

Almost surely, 2^1545221105 is an apocalyptic number.

It is an amenable number.

1545221105 is a deficient number, since it is larger than the sum of its proper divisors (309044227).

1545221105 is an equidigital number, since it uses as much as digits as its factorization.

1545221105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309044226.

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 1545221105 is about 39309.3004898332. The cubic root of 1545221105 is about 1156.1039288373.

Adding to 1545221105 its reverse (5011225451), we get a palindrome (6556446556).

The spelling of 1545221105 in words is "one billion, five hundred forty-five million, two hundred twenty-one thousand, one hundred five".