2185311445 has 8 divisors (see below), whose sum is σ = 2623394520. Its totient is φ = 1747568640.

The previous prime is 2185311431. The next prime is 2185311451. The reversal of 2185311445 is 5441135812.

It can be written as a sum of positive squares in 4 ways, for example, as 181764324 + 2003547121 = 13482^2 + 44761^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2185311445 - 2⁵ = 2185311413 is a prime.

It is a super-2 number, since 2×2185311445² = 9551172223295976050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2185311445.

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, 70716 + ... + 96805.

It is an arithmetic number, because the mean of its divisors is an integer number (327924315).

Almost surely, 2^2185311445 is an apocalyptic number.

It is an amenable number.

2185311445 is a deficient number, since it is larger than the sum of its proper divisors (438083075).

2185311445 is a wasteful number, since it uses less digits than its factorization.

2185311445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170135.

The product of its digits is 19200, while the sum is 34.

The square root of 2185311445 is about 46747.3148426730. The cubic root of 2185311445 is about 1297.6904644767.

The spelling of 2185311445 in words is "two billion, one hundred eighty-five million, three hundred eleven thousand, four hundred forty-five".