1311520225 has 6 divisors (see below), whose sum is σ = 1626285110. Its totient is φ = 1049216160.

The previous prime is 1311520213. The next prime is 1311520229. The reversal of 1311520225 is 5220251131.

It can be written as a sum of positive squares in 3 ways, for example, as 344807761 + 966712464 = 18569^2 + 31092^2 .

It is not a de Polignac number, because 1311520225 - 2¹⁷ = 1311389153 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1311520196 and 1311520205.

It is not an unprimeable number, because it can be changed into a prime (1311520229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26230380 + ... + 26230429.

Almost surely, 2^1311520225 is an apocalyptic number.

It is an amenable number.

1311520225 is a deficient number, since it is larger than the sum of its proper divisors (314764885).

1311520225 is an equidigital number, since it uses as much as digits as its factorization.

1311520225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52460819 (or 52460814 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1311520225 is about 36214.9171613025. The cubic root of 1311520225 is about 1094.6072763033.

Adding to 1311520225 its reverse (5220251131), we get a palindrome (6531771356).

The spelling of 1311520225 in words is "one billion, three hundred eleven million, five hundred twenty thousand, two hundred twenty-five".