1131435561 has 16 divisors (see below), whose sum is σ = 1603554624. Its totient is φ = 707149824.

The previous prime is 1131435517. The next prime is 1131435563. The reversal of 1131435561 is 1655341311.

It is not a de Polignac number, because 1131435561 - 2⁶ = 1131435497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1131435563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30055 + ... + 56268.

It is an arithmetic number, because the mean of its divisors is an integer number (100222164).

Almost surely, 2^1131435561 is an apocalyptic number.

It is an amenable number.

1131435561 is a deficient number, since it is larger than the sum of its proper divisors (472119063).

1131435561 is a wasteful number, since it uses less digits than its factorization.

1131435561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86600.

The product of its digits is 5400, while the sum is 30.

The square root of 1131435561 is about 33636.8185326734. The cubic root of 1131435561 is about 1042.0213280167.

Adding to 1131435561 its reverse (1655341311), we get a palindrome (2786776872).

The spelling of 1131435561 in words is "one billion, one hundred thirty-one million, four hundred thirty-five thousand, five hundred sixty-one".