2145440125 has 8 divisors (see below), whose sum is σ = 2677509432. Its totient is φ = 1716352000.

The previous prime is 2145440071. The next prime is 2145440147. The reversal of 2145440125 is 5210445412.

It can be written as a sum of positive squares in 4 ways, for example, as 4897369 + 2140542756 = 2213^2 + 46266^2 .

It is not a de Polignac number, because 2145440125 - 2⁹ = 2145439613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2145440093 and 2145440102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8581636 + ... + 8581885.

It is an arithmetic number, because the mean of its divisors is an integer number (334688679).

Almost surely, 2^2145440125 is an apocalyptic number.

2145440125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2145440125 is a deficient number, since it is larger than the sum of its proper divisors (532069307).

2145440125 is an equidigital number, since it uses as much as digits as its factorization.

2145440125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17163536 (or 17163526 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

The square root of 2145440125 is about 46318.8959820935. The cubic root of 2145440125 is about 1289.7497912258.

Adding to 2145440125 its reverse (5210445412), we get a palindrome (7355885537).

It can be divided in two parts, 2145 and 440125, that added together give a triangular number (442270 = T₉₄₀).

The spelling of 2145440125 in words is "two billion, one hundred forty-five million, four hundred forty thousand, one hundred twenty-five".