2172535813 has 4 divisors (see below), whose sum is σ = 2482898080. Its totient is φ = 1862173548.

The previous prime is 2172535793. The next prime is 2172535861. The reversal of 2172535813 is 3185352712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2172535813 - 2²⁵ = 2138981381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172538813) 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, 155181123 + ... + 155181136.

It is an arithmetic number, because the mean of its divisors is an integer number (620724520).

Almost surely, 2^2172535813 is an apocalyptic number.

It is an amenable number.

2172535813 is a deficient number, since it is larger than the sum of its proper divisors (310362267).

2172535813 is an equidigital number, since it uses as much as digits as its factorization.

2172535813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310362266.

The product of its digits is 50400, while the sum is 37.

The square root of 2172535813 is about 46610.4689206191. The cubic root of 2172535813 is about 1295.1566946640.

The spelling of 2172535813 in words is "two billion, one hundred seventy-two million, five hundred thirty-five thousand, eight hundred thirteen".