2513215805 has 4 divisors (see below), whose sum is σ = 3015858972. Its totient is φ = 2010572640.

The previous prime is 2513215769. The next prime is 2513215811. The reversal of 2513215805 is 5085123152.

2513215805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1703130361 + 810085444 = 41269^2 + 28462^2 .

It is not a de Polignac number, because 2513215805 - 2⁶ = 2513215741 is a prime.

It is a Duffinian number.

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, 251321576 + ... + 251321585.

It is an arithmetic number, because the mean of its divisors is an integer number (753964743).

Almost surely, 2^2513215805 is an apocalyptic number.

It is an amenable number.

2513215805 is a deficient number, since it is larger than the sum of its proper divisors (502643167).

2513215805 is an equidigital number, since it uses as much as digits as its factorization.

2513215805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502643166.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 2513215805 is about 50131.9838526265. The cubic root of 2513215805 is about 1359.5961540608.

Adding to 2513215805 its reverse (5085123152), we get a palindrome (7598338957).

The spelling of 2513215805 in words is "two billion, five hundred thirteen million, two hundred fifteen thousand, eight hundred five".