1131631125 has 32 divisors (see below), whose sum is σ = 1933950720. Its totient is φ = 587217600.

The previous prime is 1131631121. The next prime is 1131631141. The reversal of 1131631125 is 5211361311.

It is not a de Polignac number, because 1131631125 - 2² = 1131631121 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1131631095 and 1131631104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131631121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26905 + ... + 54654.

It is an arithmetic number, because the mean of its divisors is an integer number (60435960).

Almost surely, 2^1131631125 is an apocalyptic number.

1131631125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1131631125 is a deficient number, since it is larger than the sum of its proper divisors (802319595).

1131631125 is an equidigital number, since it uses as much as digits as its factorization.

1131631125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81614 (or 81604 counting only the distinct ones).

The product of its digits is 540, while the sum is 24.

The square root of 1131631125 is about 33639.7254001872. The cubic root of 1131631125 is about 1042.0813609301.

Adding to 1131631125 its reverse (5211361311), we get a palindrome (6342992436).

The spelling of 1131631125 in words is "one billion, one hundred thirty-one million, six hundred thirty-one thousand, one hundred twenty-five".