2171854469 has 2 divisors, whose sum is σ = 2171854470. Its totient is φ = 2171854468.

The previous prime is 2171854417. The next prime is 2171854471. The reversal of 2171854469 is 9644581712.

It is a happy number.

2171854469 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1274133025 + 897721444 = 35695^2 + 29962^2 .

It is a cyclic number.

It is not a de Polignac number, because 2171854469 - 2¹⁶ = 2171788933 is a prime.

It is a super-2 number, since 2×2171854469² = 9433903669030543922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 2171854471, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2171850469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085927234 + 1085927235.

It is an arithmetic number, because the mean of its divisors is an integer number (1085927235).

Almost surely, 2^2171854469 is an apocalyptic number.

It is an amenable number.

2171854469 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171854469 is an equidigital number, since it uses as much as digits as its factorization.

2171854469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 47.

The square root of 2171854469 is about 46603.1594315235. The cubic root of 2171854469 is about 1295.0212861545.

The spelling of 2171854469 in words is "two billion, one hundred seventy-one million, eight hundred fifty-four thousand, four hundred sixty-nine".