11531387684 has 6 divisors (see below), whose sum is σ = 20179928454. Its totient is φ = 5765693840.

The previous prime is 11531387683. The next prime is 11531387731. The reversal of 11531387684 is 48678313511.

It can be written as a sum of positive squares in only one way, i.e., 10460789284 + 1070598400 = 102278^2 + 32720^2 .

It is not an unprimeable number, because it can be changed into a prime (11531387683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1441423457 + ... + 1441423464.

It is an arithmetic number, because the mean of its divisors is an integer number (3363321409).

Almost surely, 2^11531387684 is an apocalyptic number.

It is an amenable number.

11531387684 is a deficient number, since it is larger than the sum of its proper divisors (8648540770).

11531387684 is a wasteful number, since it uses less digits than its factorization.

11531387684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2882846925 (or 2882846923 counting only the distinct ones).

The product of its digits is 483840, while the sum is 47.

The spelling of 11531387684 in words is "eleven billion, five hundred thirty-one million, three hundred eighty-seven thousand, six hundred eighty-four".