11979371519 has 4 divisors (see below), whose sum is σ = 12089274120. Its totient is φ = 11869468920.

The previous prime is 11979371471. The next prime is 11979371527. The reversal of 11979371519 is 91517397911.

It is a happy number.

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 11979371519 - 2⁸ = 11979371263 is a prime.

It is a super-2 number, since 2×11979371519² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11979371549) 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, 54951137 + ... + 54951354.

It is an arithmetic number, because the mean of its divisors is an integer number (3022318530).

Almost surely, 2^11979371519 is an apocalyptic number.

11979371519 is a deficient number, since it is larger than the sum of its proper divisors (109902601).

11979371519 is a wasteful number, since it uses less digits than its factorization.

11979371519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109902600.

The product of its digits is 535815, while the sum is 53.

The spelling of 11979371519 in words is "eleven billion, nine hundred seventy-nine million, three hundred seventy-one thousand, five hundred nineteen".