646105103 has 4 divisors (see below), whose sum is σ = 738405840. Its totient is φ = 553804368.

The previous prime is 646105091. The next prime is 646105129. The reversal of 646105103 is 301501646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 301501646 = 2 ⋅150750823.

It is a cyclic number.

It is not a de Polignac number, because 646105103 - 2¹² = 646101007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646105133) 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, 46150358 + ... + 46150371.

It is an arithmetic number, because the mean of its divisors is an integer number (184601460).

Almost surely, 2^646105103 is an apocalyptic number.

646105103 is a deficient number, since it is larger than the sum of its proper divisors (92300737).

646105103 is an equidigital number, since it uses as much as digits as its factorization.

646105103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92300736.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 646105103 is about 25418.5975812986. The cubic root of 646105103 is about 864.5054265658.

Adding to 646105103 its reverse (301501646), we get a palindrome (947606749).

The spelling of 646105103 in words is "six hundred forty-six million, one hundred five thousand, one hundred three".