105640187 has 2 divisors, whose sum is σ = 105640188. Its totient is φ = 105640186.

The previous prime is 105640177. The next prime is 105640189. The reversal of 105640187 is 781046501.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105640187 is a prime.

It is a super-2 number, since 2×105640187² = 22319698218789938, which contains 22 as substring.

Together with 105640189, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (105640189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52820093 + 52820094.

It is an arithmetic number, because the mean of its divisors is an integer number (52820094).

Almost surely, 2^105640187 is an apocalyptic number.

105640187 is a deficient number, since it is larger than the sum of its proper divisors (1).

105640187 is an equidigital number, since it uses as much as digits as its factorization.

105640187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 105640187 is about 10278.1412230033. The cubic root of 105640187 is about 472.7262516754.

Adding to 105640187 its reverse (781046501), we get a palindrome (886686688).

The spelling of 105640187 in words is "one hundred five million, six hundred forty thousand, one hundred eighty-seven".