1331155225 has 9 divisors (see below), whose sum is σ = 1650858717. Its totient is φ = 1064778240.

The previous prime is 1331155223. The next prime is 1331155271. The reversal of 1331155225 is 5225511331.

The square root of 1331155225 is 36485.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 119836809 + 1211318416 = 10947^2 + 34804^2 .

It is not a de Polignac number, because 1331155225 - 2¹ = 1331155223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331155193 and 1331155202.

It is not an unprimeable number, because it can be changed into a prime (1331155223) by changing a digit.

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 8 ways as a sum of consecutive naturals, for example, 178777 + ... + 186073.

Almost surely, 2^1331155225 is an apocalyptic number.

1331155225 is the 36485-th square number.

1331155225 is the 18243-rd centered octagonal number.

It is an amenable number.

1331155225 is a deficient number, since it is larger than the sum of its proper divisors (319703492).

1331155225 is an frugal number, since it uses more digits than its factorization.

1331155225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14604 (or 7302 counting only the distinct ones).

The product of its digits is 4500, while the sum is 28.

The cubic root of 1331155225 is about 1100.0427600458.

Adding to 1331155225 its reverse (5225511331), we get a palindrome (6556666556).

The spelling of 1331155225 in words is "one billion, three hundred thirty-one million, one hundred fifty-five thousand, two hundred twenty-five".