105120661 has 4 divisors (see below), whose sum is σ = 105215392. Its totient is φ = 105025932.

The previous prime is 105120643. The next prime is 105120671. The reversal of 105120661 is 166021501.

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, and also an emirpimes, since its reverse is a distinct semiprime: 166021501 = 71 ⋅2338331.

It is a cyclic number.

It is not a de Polignac number, because 105120661 - 2⁹ = 105120149 is a prime.

It is a super-2 number, since 2×105120661² = 22100706738153842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105120601) 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, 45681 + ... + 47926.

It is an arithmetic number, because the mean of its divisors is an integer number (26303848).

Almost surely, 2^105120661 is an apocalyptic number.

It is an amenable number.

105120661 is a deficient number, since it is larger than the sum of its proper divisors (94731).

105120661 is an equidigital number, since it uses as much as digits as its factorization.

105120661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94730.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 105120661 is about 10252.8367294130. The cubic root of 105120661 is about 471.9500404964.

It can be divided in two parts, 1051 and 20661, that added together give a palindrome (21712).

The spelling of 105120661 in words is "one hundred five million, one hundred twenty thousand, six hundred sixty-one".