8171820369 has 6 divisors (see below), whose sum is σ = 11803740546. Its totient is φ = 5447880240.

The previous prime is 8171820367. The next prime is 8171820373. The reversal of 8171820369 is 9630281718.

It can be written as a sum of positive squares in only one way, i.e., 8156257344 + 15563025 = 90312^2 + 3945^2 .

It is not a de Polignac number, because 8171820369 - 2¹ = 8171820367 is a prime.

It is a super-2 number, since 2×8171820369² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8171820367) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 453990012 + ... + 453990029.

It is an arithmetic number, because the mean of its divisors is an integer number (1967290091).

Almost surely, 2^8171820369 is an apocalyptic number.

It is an amenable number.

8171820369 is a deficient number, since it is larger than the sum of its proper divisors (3631920177).

8171820369 is a wasteful number, since it uses less digits than its factorization.

8171820369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907980047 (or 907980044 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 8171820369 is about 90398.1214904381. The cubic root of 8171820369 is about 2014.2170621863.

It can be divided in two parts, 817 and 1820369, that added together give a triangular number (1821186 = T₁₉₀₈).

The spelling of 8171820369 in words is "eight billion, one hundred seventy-one million, eight hundred twenty thousand, three hundred sixty-nine".