11531331465 has 16 divisors (see below), whose sum is σ = 18477160128. Its totient is φ = 6141033536.

The previous prime is 11531331443. The next prime is 11531331473. The reversal of 11531331465 is 56413313511.

It is a happy number.

11531331465 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 11531331465 - 2⁷ = 11531331337 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 552534 + ... + 573023.

It is an arithmetic number, because the mean of its divisors is an integer number (1154822508).

Almost surely, 2^11531331465 is an apocalyptic number.

11531331465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11531331465 is a deficient number, since it is larger than the sum of its proper divisors (6945828663).

11531331465 is a wasteful number, since it uses less digits than its factorization.

11531331465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126248.

The product of its digits is 16200, while the sum is 33.

Adding to 11531331465 its reverse (56413313511), we get a palindrome (67944644976).

The spelling of 11531331465 in words is "eleven billion, five hundred thirty-one million, three hundred thirty-one thousand, four hundred sixty-five".