105639061 has 4 divisors (see below), whose sum is σ = 115242624. Its totient is φ = 96035500.

The previous prime is 105639047. The next prime is 105639077. The reversal of 105639061 is 160936501.

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 not a de Polignac number, because 105639061 - 2⁵ = 105639029 is a prime.

It is a super-2 number, since 2×105639061² = 22319222417923442, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105639011) 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, 4801765 + ... + 4801786.

It is an arithmetic number, because the mean of its divisors is an integer number (28810656).

Almost surely, 2^105639061 is an apocalyptic number.

105639061 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

105639061 is the 4597-th centered decagonal number.

It is an amenable number.

105639061 is a deficient number, since it is larger than the sum of its proper divisors (9603563).

105639061 is an equidigital number, since it uses as much as digits as its factorization.

105639061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9603562.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 105639061 is about 10278.0864464160. The cubic root of 105639061 is about 472.7245721011.

The spelling of 105639061 in words is "one hundred five million, six hundred thirty-nine thousand, sixty-one".