100115555 has 8 divisors (see below), whose sum is σ = 120219792. Its totient is φ = 80038368.

The previous prime is 100115551. The next prime is 100115581. The reversal of 100115555 is 555511001.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 100115555 - 2² = 100115551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 100115555.

It is not an unprimeable number, because it can be changed into a prime (100115551) 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, 2552 + ... + 14378.

It is an arithmetic number, because the mean of its divisors is an integer number (15027474).

Almost surely, 2^100115555 is an apocalyptic number.

100115555 is a deficient number, since it is larger than the sum of its proper divisors (20104237).

100115555 is a wasteful number, since it uses less digits than its factorization.

100115555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13525.

The product of its (nonzero) digits is 625, while the sum is 23.

The square root of 100115555 is about 10005.7760818439. The cubic root of 100115555 is about 464.3376008059.

Adding to 100115555 its reverse (555511001), we get a palindrome (655626556).

The spelling of 100115555 in words is "one hundred million, one hundred fifteen thousand, five hundred fifty-five".