6851489821 has 8 divisors (see below), whose sum is σ = 7914020544. Its totient is φ = 5862237120.

The previous prime is 6851489807. The next prime is 6851489903. The reversal of 6851489821 is 1289841586.

It is a happy number.

6851489821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 6851489821 - 2¹³ = 6851481629 is a prime.

It is a super-2 number, since 2×6851489821² = 93885825534533224082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6851489621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18319305 + ... + 18319678.

It is an arithmetic number, because the mean of its divisors is an integer number (989252568).

Almost surely, 2^6851489821 is an apocalyptic number.

It is an amenable number.

6851489821 is a deficient number, since it is larger than the sum of its proper divisors (1062530723).

6851489821 is a wasteful number, since it uses less digits than its factorization.

6851489821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36639011.

The product of its digits is 1105920, while the sum is 52.

The square root of 6851489821 is about 82773.7266347239. The cubic root of 6851489821 is about 1899.3062860823.

The spelling of 6851489821 in words is "six billion, eight hundred fifty-one million, four hundred eighty-nine thousand, eight hundred twenty-one".