11971004687 has 4 divisors (see below), whose sum is σ = 11971969680. Its totient is φ = 11970039696.

The previous prime is 11971004657. The next prime is 11971004693. The reversal of 11971004687 is 78640017911.

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

It is a cyclic number.

It is not a de Polignac number, because 11971004687 - 2⁶ = 11971004623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11971004657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463643 + ... + 488780.

It is an arithmetic number, because the mean of its divisors is an integer number (2992992420).

Almost surely, 2^11971004687 is an apocalyptic number.

11971004687 is a deficient number, since it is larger than the sum of its proper divisors (964993).

11971004687 is an equidigital number, since it uses as much as digits as its factorization.

11971004687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964992.

The product of its (nonzero) digits is 84672, while the sum is 44.

The spelling of 11971004687 in words is "eleven billion, nine hundred seventy-one million, four thousand, six hundred eighty-seven".