1644135103 has 4 divisors (see below), whose sum is σ = 1770607048. Its totient is φ = 1517663160.

The previous prime is 1644135061. The next prime is 1644135107. The reversal of 1644135103 is 3015314461.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1644135103 - 2²¹ = 1642037951 is a prime.

It is a super-3 number, since 3×1644135103³ (a number of 29 digits) contains 333 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 (1644135107) 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, 63235953 + ... + 63235978.

It is an arithmetic number, because the mean of its divisors is an integer number (442651762).

Almost surely, 2^1644135103 is an apocalyptic number.

1644135103 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1644135103 is a deficient number, since it is larger than the sum of its proper divisors (126471945).

1644135103 is a wasteful number, since it uses less digits than its factorization.

1644135103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126471944.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1644135103 is about 40547.9358660832. The cubic root of 1644135103 is about 1180.2640180561.

Adding to 1644135103 its reverse (3015314461), we get a palindrome (4659449564).

The spelling of 1644135103 in words is "one billion, six hundred forty-four million, one hundred thirty-five thousand, one hundred three".