100556161 has 4 divisors (see below), whose sum is σ = 104928192. Its totient is φ = 96184132.

The previous prime is 100556153. The next prime is 100556191. The reversal of 100556161 is 161655001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 100556161 - 2³ = 100556153 is a prime.

It is a super-3 number, since 3×100556161³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100556191) 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, 2185981 + ... + 2186026.

It is an arithmetic number, because the mean of its divisors is an integer number (26232048).

Almost surely, 2^100556161 is an apocalyptic number.

It is an amenable number.

100556161 is a deficient number, since it is larger than the sum of its proper divisors (4372031).

100556161 is an equidigital number, since it uses as much as digits as its factorization.

100556161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4372030.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 100556161 is about 10027.7694927636. The cubic root of 100556161 is about 465.0177832641.

The spelling of 100556161 in words is "one hundred million, five hundred fifty-six thousand, one hundred sixty-one".