1835808221 has 4 divisors (see below), whose sum is σ = 1977024252. Its totient is φ = 1694592192.

The previous prime is 1835808217. The next prime is 1835808229. The reversal of 1835808221 is 1228085381.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1228085381 = 659 ⋅1863559.

It can be written as a sum of positive squares in 2 ways, for example, as 1138320121 + 697488100 = 33739^2 + 26410^2 .

It is a cyclic number.

It is not a de Polignac number, because 1835808221 - 2² = 1835808217 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 (1835808229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70607996 + ... + 70608021.

It is an arithmetic number, because the mean of its divisors is an integer number (494256063).

Almost surely, 2^1835808221 is an apocalyptic number.

It is an amenable number.

1835808221 is a deficient number, since it is larger than the sum of its proper divisors (141216031).

1835808221 is a wasteful number, since it uses less digits than its factorization.

1835808221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141216030.

The product of its (nonzero) digits is 30720, while the sum is 38.

The square root of 1835808221 is about 42846.3326435297. The cubic root of 1835808221 is about 1224.4538942468.

The spelling of 1835808221 in words is "one billion, eight hundred thirty-five million, eight hundred eight thousand, two hundred twenty-one".