1131904521 has 12 divisors (see below), whose sum is σ = 1783607280. Its totient is φ = 686002680.

The previous prime is 1131904511. The next prime is 1131904541. The reversal of 1131904521 is 1254091311.

It is a happy number.

1131904521 is a `hidden beast` number, since 1 + 131 + 9 + 0 + 4 + 521 = 666.

It is not a de Polignac number, because 1131904521 - 2¹⁷ = 1131773449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1131904511) 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, 5716591 + ... + 5716788.

It is an arithmetic number, because the mean of its divisors is an integer number (148633940).

Almost surely, 2^1131904521 is an apocalyptic number.

1131904521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1131904521 is a deficient number, since it is larger than the sum of its proper divisors (651702759).

1131904521 is a wasteful number, since it uses less digits than its factorization.

1131904521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11433396 (or 11433393 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 1131904521 is about 33643.7887432435. The cubic root of 1131904521 is about 1042.1652745921.

Adding to 1131904521 its reverse (1254091311), we get a palindrome (2385995832).

It can be divided in two parts, 113190 and 4521, that added together give a palindrome (117711).

The spelling of 1131904521 in words is "one billion, one hundred thirty-one million, nine hundred four thousand, five hundred twenty-one".