13961391871 has 8 divisors (see below), whose sum is σ = 15993779744. Its totient is φ = 11938479840.

The previous prime is 13961391859. The next prime is 13961391887. The reversal of 13961391871 is 17819316931.

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

It is not a de Polignac number, because 13961391871 - 2¹³ = 13961383679 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 (13961391071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2365800 + ... + 2371693.

It is an arithmetic number, because the mean of its divisors is an integer number (1999222468).

Almost surely, 2^13961391871 is an apocalyptic number.

13961391871 is a deficient number, since it is larger than the sum of its proper divisors (2032387873).

13961391871 is an equidigital number, since it uses as much as digits as its factorization.

13961391871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4737921.

The product of its digits is 244944, while the sum is 49.

The spelling of 13961391871 in words is "thirteen billion, nine hundred sixty-one million, three hundred ninety-one thousand, eight hundred seventy-one".