2145440001 has 16 divisors (see below), whose sum is σ = 3041872704. Its totient is φ = 1340373504.

The previous prime is 2145439999. The next prime is 2145440029. The reversal of 2145440001 is 1000445412.

It is a happy number.

It is not a de Polignac number, because 2145440001 - 2¹ = 2145439999 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2145440001.

It is not an unprimeable number, because it can be changed into a prime (2145440041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78391 + ... + 102156.

It is an arithmetic number, because the mean of its divisors is an integer number (190117044).

Almost surely, 2^2145440001 is an apocalyptic number.

It is an amenable number.

2145440001 is a deficient number, since it is larger than the sum of its proper divisors (896432703).

2145440001 is a wasteful number, since it uses less digits than its factorization.

2145440001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180800.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 2145440001 is about 46318.8946435469. The cubic root of 2145440001 is about 1289.7497663779.

Adding to 2145440001 its reverse (1000445412), we get a palindrome (3145885413).

The spelling of 2145440001 in words is "two billion, one hundred forty-five million, four hundred forty thousand, one".