1131881325 has 12 divisors (see below), whose sum is σ = 1871377248. Its totient is φ = 603670000.

The previous prime is 1131881321. The next prime is 1131881327. The reversal of 1131881325 is 5231881311.

It is not a de Polignac number, because 1131881325 - 2² = 1131881321 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131881321) 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 11 ways as a sum of consecutive naturals, for example, 7545801 + ... + 7545950.

It is an arithmetic number, because the mean of its divisors is an integer number (155948104).

Almost surely, 2^1131881325 is an apocalyptic number.

1131881325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1131881325 is a deficient number, since it is larger than the sum of its proper divisors (739495923).

1131881325 is a wasteful number, since it uses less digits than its factorization.

1131881325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15091764 (or 15091759 counting only the distinct ones).

The product of its digits is 5760, while the sum is 33.

The square root of 1131881325 is about 33643.4440121697. Note that the first 3 decimals coincide. The cubic root of 1131881325 is about 1042.1581555491.

It can be divided in two parts, 1131 and 881325, that added together give a triangular number (882456 = T₁₃₂₈).

The spelling of 1131881325 in words is "one billion, one hundred thirty-one million, eight hundred eighty-one thousand, three hundred twenty-five".