2145131245 has 4 divisors (see below), whose sum is σ = 2574157500. Its totient is φ = 1716104992.

The previous prime is 2145131237. The next prime is 2145131267. The reversal of 2145131245 is 5421315412.

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

It can be written as a sum of positive squares in 2 ways, for example, as 366569316 + 1778561929 = 19146^2 + 42173^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145131245 - 2³ = 2145131237 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214513120 + ... + 214513129.

It is an arithmetic number, because the mean of its divisors is an integer number (643539375).

Almost surely, 2^2145131245 is an apocalyptic number.

It is an amenable number.

2145131245 is a deficient number, since it is larger than the sum of its proper divisors (429026255).

2145131245 is an equidigital number, since it uses as much as digits as its factorization.

2145131245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429026254.

The product of its digits is 4800, while the sum is 28.

The square root of 2145131245 is about 46315.5615857133. The cubic root of 2145131245 is about 1289.6878929653.

Adding to 2145131245 its reverse (5421315412), we get a palindrome (7566446657).

The spelling of 2145131245 in words is "two billion, one hundred forty-five million, one hundred thirty-one thousand, two hundred forty-five".