105561187 has 4 divisors (see below), whose sum is σ = 106320760. Its totient is φ = 104801616.

The previous prime is 105561121. The next prime is 105561199. The reversal of 105561187 is 781165501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 781165501 = 71 ⋅11002331.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105561187 is a prime.

It is a super-2 number, since 2×105561187² = 22286328401697938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105562187) 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, 379578 + ... + 379855.

It is an arithmetic number, because the mean of its divisors is an integer number (26580190).

Almost surely, 2^105561187 is an apocalyptic number.

105561187 is a deficient number, since it is larger than the sum of its proper divisors (759573).

105561187 is an equidigital number, since it uses as much as digits as its factorization.

105561187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759572.

The product of its (nonzero) digits is 8400, while the sum is 34.

The square root of 105561187 is about 10274.2973969026. The cubic root of 105561187 is about 472.6083840090.

The spelling of 105561187 in words is "one hundred five million, five hundred sixty-one thousand, one hundred eighty-seven".