11643397631 has 8 divisors (see below), whose sum is σ = 12530407824. Its totient is φ = 10778843520.

The previous prime is 11643397567. The next prime is 11643397639. The reversal of 11643397631 is 13679334611.

11643397631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11643397631 - 2⁶ = 11643397567 is a prime.

It is a super-2 number, since 2×11643397631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11643397639) 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 7 ways as a sum of consecutive naturals, for example, 5612945 + ... + 5615018.

It is an arithmetic number, because the mean of its divisors is an integer number (1566300978).

Almost surely, 2^11643397631 is an apocalyptic number.

11643397631 is a deficient number, since it is larger than the sum of its proper divisors (887010193).

11643397631 is a wasteful number, since it uses less digits than its factorization.

11643397631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11228041.

The product of its digits is 244944, while the sum is 44.

The spelling of 11643397631 in words is "eleven billion, six hundred forty-three million, three hundred ninety-seven thousand, six hundred thirty-one".