100561505 has 16 divisors (see below), whose sum is σ = 131886144. Its totient is φ = 73001280.

The previous prime is 100561501. The next prime is 100561507. The reversal of 100561505 is 505165001.

It is not a de Polignac number, because 100561505 - 2² = 100561501 is a prime.

It is a super-2 number, since 2×100561505² = 20225232575730050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100561501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36227 + ... + 38903.

It is an arithmetic number, because the mean of its divisors is an integer number (8242884).

Almost surely, 2^100561505 is an apocalyptic number.

It is an amenable number.

100561505 is a deficient number, since it is larger than the sum of its proper divisors (31324639).

100561505 is a wasteful number, since it uses less digits than its factorization.

100561505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3376.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 100561505 is about 10028.0359492774. The cubic root of 100561505 is about 465.0260208201.

The spelling of 100561505 in words is "one hundred million, five hundred sixty-one thousand, five hundred five".