61100109 has 24 divisors (see below), whose sum is σ = 105299520. Its totient is φ = 34913592.

The previous prime is 61100093. The next prime is 61100147. The reversal of 61100109 is 90100116.

It is not a de Polignac number, because 61100109 - 2⁴ = 61100093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61100091 and 61100100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61100509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21769 + ... + 24414.

It is an arithmetic number, because the mean of its divisors is an integer number (4387480).

Almost surely, 2^61100109 is an apocalyptic number.

It is an amenable number.

61100109 is a deficient number, since it is larger than the sum of its proper divisors (44199411).

61100109 is a wasteful number, since it uses less digits than its factorization.

61100109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46206 (or 46193 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The square root of 61100109 is about 7816.6558706393. The cubic root of 61100109 is about 393.8649442198.

The spelling of 61100109 in words is "sixty-one million, one hundred thousand, one hundred nine".