6906931921 has 8 divisors (see below), whose sum is σ = 7361656704. Its totient is φ = 6457588800.

The previous prime is 6906931919. The next prime is 6906931961. The reversal of 6906931921 is 1291396096.

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 6906931921 - 2¹ = 6906931919 is a prime.

It is a super-2 number, since 2×6906931921² = 95411417122657500482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6906931961) 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, 1342765 + ... + 1347898.

It is an arithmetic number, because the mean of its divisors is an integer number (920207088).

Almost surely, 2^6906931921 is an apocalyptic number.

It is an amenable number.

6906931921 is a deficient number, since it is larger than the sum of its proper divisors (454724783).

6906931921 is a wasteful number, since it uses less digits than its factorization.

6906931921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2690831.

The product of its (nonzero) digits is 157464, while the sum is 46.

The square root of 6906931921 is about 83107.9534160239. The cubic root of 6906931921 is about 1904.4155771170.

The spelling of 6906931921 in words is "six billion, nine hundred six million, nine hundred thirty-one thousand, nine hundred twenty-one".