1253204145 has 12 divisors (see below), whose sum is σ = 2172220596. Its totient is φ = 668375520.

The previous prime is 1253204143. The next prime is 1253204153. The reversal of 1253204145 is 5414023521.

It can be written as a sum of positive squares in 2 ways, for example, as 800663616 + 452540529 = 28296^2 + 21273^2 .

It is not a de Polignac number, because 1253204145 - 2¹ = 1253204143 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1253204143) 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 11 ways as a sum of consecutive naturals, for example, 13924446 + ... + 13924535.

It is an arithmetic number, because the mean of its divisors is an integer number (181018383).

Almost surely, 2^1253204145 is an apocalyptic number.

1253204145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1253204145 is a deficient number, since it is larger than the sum of its proper divisors (919016451).

1253204145 is a wasteful number, since it uses less digits than its factorization.

1253204145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27848992 (or 27848989 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 1253204145 is about 35400.6235114581. The cubic root of 1253204145 is about 1078.1369758468.

Adding to 1253204145 its reverse (5414023521), we get a palindrome (6667227666).

The spelling of 1253204145 in words is "one billion, two hundred fifty-three million, two hundred four thousand, one hundred forty-five".