1131612665 has 4 divisors (see below), whose sum is σ = 1357935204. Its totient is φ = 905290128.

The previous prime is 1131612649. The next prime is 1131612679. The reversal of 1131612665 is 5662161311.

1131612665 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 682045456 + 449567209 = 26116^2 + 21203^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131612665 - 2⁴ = 1131612649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113161262 + ... + 113161271.

It is an arithmetic number, because the mean of its divisors is an integer number (339483801).

Almost surely, 2^1131612665 is an apocalyptic number.

It is an amenable number.

1131612665 is a deficient number, since it is larger than the sum of its proper divisors (226322539).

1131612665 is an equidigital number, since it uses as much as digits as its factorization.

1131612665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226322538.

The product of its digits is 6480, while the sum is 32.

The square root of 1131612665 is about 33639.4510210853. The cubic root of 1131612665 is about 1042.0756944998.

Adding to 1131612665 its reverse (5662161311), we get a palindrome (6793773976).

The spelling of 1131612665 in words is "one billion, one hundred thirty-one million, six hundred twelve thousand, six hundred sixty-five".