6905163121 has 4 divisors (see below), whose sum is σ = 6905334132. Its totient is φ = 6904992112.

The previous prime is 6905163113. The next prime is 6905163131. The reversal of 6905163121 is 1213615096.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3044280625 + 3860882496 = 55175^2 + 62136^2 .

It is a cyclic number.

It is not a de Polignac number, because 6905163121 - 2³ = 6905163113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6905163131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12531 + ... + 118183.

It is an arithmetic number, because the mean of its divisors is an integer number (1726333533).

Almost surely, 2^6905163121 is an apocalyptic number.

It is an amenable number.

6905163121 is a deficient number, since it is larger than the sum of its proper divisors (171011).

6905163121 is a wasteful number, since it uses less digits than its factorization.

6905163121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171010.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 6905163121 is about 83097.3111538514. The cubic root of 6905163121 is about 1904.2529956263.

The spelling of 6905163121 in words is "six billion, nine hundred five million, one hundred sixty-three thousand, one hundred twenty-one".