1311235225 has 24 divisors (see below), whose sum is σ = 1654392128. Its totient is φ = 1030708800.

The previous prime is 1311235213. The next prime is 1311235243. The reversal of 1311235225 is 5225321131.

It is not a de Polignac number, because 1311235225 - 2¹⁷ = 1311104153 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1311235225.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 905452 + ... + 906898.

Almost surely, 2^1311235225 is an apocalyptic number.

It is an amenable number.

1311235225 is a deficient number, since it is larger than the sum of its proper divisors (343156903).

1311235225 is a wasteful number, since it uses less digits than its factorization.

1311235225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2065 (or 2060 counting only the distinct ones).

The product of its digits is 1800, while the sum is 25.

The square root of 1311235225 is about 36210.9821048808. The cubic root of 1311235225 is about 1094.5279826542.

Adding to 1311235225 its reverse (5225321131), we get a palindrome (6536556356).

The spelling of 1311235225 in words is "one billion, three hundred eleven million, two hundred thirty-five thousand, two hundred twenty-five".