100255561 has 4 divisors (see below), whose sum is σ = 114577792. Its totient is φ = 85933332.

The previous prime is 100255543. The next prime is 100255567. The reversal of 100255561 is 165552001.

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 100255561 - 2⁹ = 100255049 is a prime.

It is a super-2 number, since 2×100255561² = 20102355022849442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (100255567) 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, 7161105 + ... + 7161118.

It is an arithmetic number, because the mean of its divisors is an integer number (28644448).

Almost surely, 2^100255561 is an apocalyptic number.

It is an amenable number.

100255561 is a deficient number, since it is larger than the sum of its proper divisors (14322231).

100255561 is an equidigital number, since it uses as much as digits as its factorization.

100255561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14322230.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 100255561 is about 10012.7698964872. The cubic root of 100255561 is about 464.5539500347.

The spelling of 100255561 in words is "one hundred million, two hundred fifty-five thousand, five hundred sixty-one".