1131555431225 has 12 divisors (see below), whose sum is σ = 1403147601660. Its totient is φ = 905232172800.

The previous prime is 1131555431183. The next prime is 1131555431233. The reversal of 1131555431225 is 5221345551311.

It can be written as a sum of positive squares in 6 ways, for example, as 51641653504 + 1079913777721 = 227248^2 + 1039189^2 .

It is not a de Polignac number, because 1131555431225 - 2⁶ = 1131555431161 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1907285 + ... + 2429165.

It is an arithmetic number, because the mean of its divisors is an integer number (116928966805).

Almost surely, 2^{1131555431225} is an apocalyptic number.

It is an amenable number.

1131555431225 is a deficient number, since it is larger than the sum of its proper divisors (271592170435).

1131555431225 is an equidigital number, since it uses as much as digits as its factorization.

1131555431225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608620 (or 608615 counting only the distinct ones).

The product of its digits is 90000, while the sum is 38.

The spelling of 1131555431225 in words is "one trillion, one hundred thirty-one billion, five hundred fifty-five million, four hundred thirty-one thousand, two hundred twenty-five".