115991018123 has 4 divisors (see below), whose sum is σ = 115999779480. Its totient is φ = 115982256768.

The previous prime is 115991018119. The next prime is 115991018137. The reversal of 115991018123 is 321810199511.

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 115991018123 - 2² = 115991018119 is a prime.

It is a super-2 number, since 2×115991018123² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115991018153) 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, 4360790 + ... + 4387307.

It is an arithmetic number, because the mean of its divisors is an integer number (28999944870).

Almost surely, 2^115991018123 is an apocalyptic number.

115991018123 is a deficient number, since it is larger than the sum of its proper divisors (8761357).

115991018123 is an equidigital number, since it uses as much as digits as its factorization.

115991018123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8761356.

The product of its (nonzero) digits is 19440, while the sum is 41.

The spelling of 115991018123 in words is "one hundred fifteen billion, nine hundred ninety-one million, eighteen thousand, one hundred twenty-three".