13919551979 has 4 divisors (see below), whose sum is σ = 14399536560. Its totient is φ = 13439567400.

The previous prime is 13919551949. The next prime is 13919552011. The reversal of 13919551979 is 97915591931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97915591931 = 18661 ⋅5247071.

It is a cyclic number.

It is not a de Polignac number, because 13919551979 - 2¹² = 13919547883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13919551949) 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, 239992247 + ... + 239992304.

It is an arithmetic number, because the mean of its divisors is an integer number (3599884140).

Almost surely, 2^13919551979 is an apocalyptic number.

13919551979 is a deficient number, since it is larger than the sum of its proper divisors (479984581).

13919551979 is an equidigital number, since it uses as much as digits as its factorization.

13919551979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479984580.

The product of its digits is 3444525, while the sum is 59.

The spelling of 13919551979 in words is "thirteen billion, nine hundred nineteen million, five hundred fifty-one thousand, nine hundred seventy-nine".