13191977401 has 4 divisors (see below), whose sum is σ = 13192243072. Its totient is φ = 13191711732.

The previous prime is 13191977377. The next prime is 13191977411. The reversal of 13191977401 is 10477919131.

13191977401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10477919131 = 1009 ⋅10384459.

It is a cyclic number.

It is not a de Polignac number, because 13191977401 - 2⁷ = 13191977273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13191977411) 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 3 ways as a sum of consecutive naturals, for example, 33681 + ... + 165886.

It is an arithmetic number, because the mean of its divisors is an integer number (3298060768).

Almost surely, 2^13191977401 is an apocalyptic number.

It is an amenable number.

13191977401 is a deficient number, since it is larger than the sum of its proper divisors (265671).

13191977401 is an equidigital number, since it uses as much as digits as its factorization.

13191977401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265670.

The product of its (nonzero) digits is 47628, while the sum is 43.

The spelling of 13191977401 in words is "thirteen billion, one hundred ninety-one million, nine hundred seventy-seven thousand, four hundred one".