1225204135 has 16 divisors (see below), whose sum is σ = 1536532416. Its totient is φ = 936103168.

The previous prime is 1225204129. The next prime is 1225204157. The reversal of 1225204135 is 5314025221.

It is a cyclic number.

It is not a de Polignac number, because 1225204135 - 2¹⁷ = 1225073063 is a prime.

It is a super-2 number, since 2×1225204135² = 3002250344842196450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 69987 + ... + 85723.

It is an arithmetic number, because the mean of its divisors is an integer number (96033276).

Almost surely, 2^1225204135 is an apocalyptic number.

1225204135 is a deficient number, since it is larger than the sum of its proper divisors (311328281).

1225204135 is a wasteful number, since it uses less digits than its factorization.

1225204135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16442.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1225204135 is about 35002.9160928058. The cubic root of 1225204135 is about 1070.0469117931.

Adding to 1225204135 its reverse (5314025221), we get a palindrome (6539229356).

The spelling of 1225204135 in words is "one billion, two hundred twenty-five million, two hundred four thousand, one hundred thirty-five".