2145532513 has 4 divisors (see below), whose sum is σ = 2146336660. Its totient is φ = 2144728368.

The previous prime is 2145532471. The next prime is 2145532531. The reversal of 2145532513 is 3152355412.

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 482768784 + 1662763729 = 21972^2 + 40777^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145532513 - 2²⁵ = 2111978081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2145532553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398058 + ... + 403411.

It is an arithmetic number, because the mean of its divisors is an integer number (536584165).

Almost surely, 2^2145532513 is an apocalyptic number.

It is an amenable number.

2145532513 is a deficient number, since it is larger than the sum of its proper divisors (804147).

2145532513 is an equidigital number, since it uses as much as digits as its factorization.

2145532513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804146.

The product of its digits is 18000, while the sum is 31.

The square root of 2145532513 is about 46319.8932749202. The cubic root of 2145532513 is about 1289.7683042404.

Adding to 2145532513 its reverse (3152355412), we get a palindrome (5297887925).

The spelling of 2145532513 in words is "two billion, one hundred forty-five million, five hundred thirty-two thousand, five hundred thirteen".