1645432103 has 6 divisors (see below), whose sum is σ = 1914074136. Its totient is φ = 1410370332.

The previous prime is 1645432093. The next prime is 1645432111. The reversal of 1645432103 is 3012345461.

It is not a de Polignac number, because 1645432103 - 2⁶ = 1645432039 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 (1645432123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16790075 + ... + 16790172.

It is an arithmetic number, because the mean of its divisors is an integer number (319012356).

Almost surely, 2^1645432103 is an apocalyptic number.

1645432103 is a deficient number, since it is larger than the sum of its proper divisors (268642033).

1645432103 is an equidigital number, since it uses as much as digits as its factorization.

1645432103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33580261 (or 33580254 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 1645432103 is about 40563.9261290127. The cubic root of 1645432103 is about 1180.5742926544.

Adding to 1645432103 its reverse (3012345461), we get a palindrome (4657777564).

The spelling of 1645432103 in words is "one billion, six hundred forty-five million, four hundred thirty-two thousand, one hundred three".