13171977971 has 4 divisors (see below), whose sum is σ = 13173735000. Its totient is φ = 13170220944.

The previous prime is 13171977953. The next prime is 13171977983. The reversal of 13171977971 is 17977917131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17977917131 = 947 ⋅18984073.

It is a cyclic number.

It is not a de Polignac number, because 13171977971 - 2¹⁰ = 13171976947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13171977941) 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, 867221 + ... + 882278.

It is an arithmetic number, because the mean of its divisors is an integer number (3293433750).

Almost surely, 2^13171977971 is an apocalyptic number.

13171977971 is a deficient number, since it is larger than the sum of its proper divisors (1757029).

13171977971 is an equidigital number, since it uses as much as digits as its factorization.

13171977971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1757028.

The product of its digits is 583443, while the sum is 53.

The spelling of 13171977971 in words is "thirteen billion, one hundred seventy-one million, nine hundred seventy-seven thousand, nine hundred seventy-one".