111211981519 has 2 divisors, whose sum is σ = 111211981520. Its totient is φ = 111211981518.

The previous prime is 111211981483. The next prime is 111211981523. The reversal of 111211981519 is 915189112111.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (915189112111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111211981519 - 2¹⁷ = 111211850447 is a prime.

It is a super-3 number, since 3×111211981519³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111211951519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55605990759 + 55605990760.

It is an arithmetic number, because the mean of its divisors is an integer number (55605990760).

Almost surely, 2^111211981519 is an apocalyptic number.

111211981519 is a deficient number, since it is larger than the sum of its proper divisors (1).

111211981519 is an equidigital number, since it uses as much as digits as its factorization.

111211981519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 40.

The spelling of 111211981519 in words is "one hundred eleven billion, two hundred eleven million, nine hundred eighty-one thousand, five hundred nineteen".