1644601125 has 16 divisors (see below), whose sum is σ = 2736616896. Its totient is φ = 877120400.

The previous prime is 1644601081. The next prime is 1644601163. The reversal of 1644601125 is 5211064461.

It is not a de Polignac number, because 1644601125 - 2¹⁰ = 1644600101 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1644601092 and 1644601101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2192427 + ... + 2193176.

It is an arithmetic number, because the mean of its divisors is an integer number (171038556).

Almost surely, 2^1644601125 is an apocalyptic number.

1644601125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1644601125 is a deficient number, since it is larger than the sum of its proper divisors (1092015771).

1644601125 is an equidigital number, since it uses as much as digits as its factorization.

1644601125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4385621 (or 4385611 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 1644601125 is about 40553.6820153238. The cubic root of 1644601125 is about 1180.3755208634.

Adding to 1644601125 its reverse (5211064461), we get a palindrome (6855665586).

The spelling of 1644601125 in words is "one billion, six hundred forty-four million, six hundred one thousand, one hundred twenty-five".