101561109 has 16 divisors (see below), whose sum is σ = 146036352. Its totient is φ = 62411328.

The previous prime is 101561101. The next prime is 101561143. The reversal of 101561109 is 901165101.

It is not a de Polignac number, because 101561109 - 2³ = 101561101 is a prime.

It is a super-2 number, since 2×101561109² = 20629317722619762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101561101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36367 + ... + 39059.

It is an arithmetic number, because the mean of its divisors is an integer number (9127272).

Almost surely, 2^101561109 is an apocalyptic number.

It is an amenable number.

101561109 is a deficient number, since it is larger than the sum of its proper divisors (44475243).

101561109 is a wasteful number, since it uses less digits than its factorization.

101561109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3676.

The product of its (nonzero) digits is 270, while the sum is 24.

The square root of 101561109 is about 10077.7531722106. The cubic root of 101561109 is about 466.5617645727.

The spelling of 101561109 in words is "one hundred one million, five hundred sixty-one thousand, one hundred nine".