6915313681 has 4 divisors (see below), whose sum is σ = 6917383152. Its totient is φ = 6913244212.

The previous prime is 6915313633. The next prime is 6915313733. The reversal of 6915313681 is 1863135196.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6915313681 - 2⁷ = 6915313553 is a prime.

It is a super-3 number, since 3×6915313681³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6915313381) 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, 1029715 + ... + 1036408.

It is an arithmetic number, because the mean of its divisors is an integer number (1729345788).

Almost surely, 2^6915313681 is an apocalyptic number.

It is an amenable number.

6915313681 is a deficient number, since it is larger than the sum of its proper divisors (2069471).

6915313681 is a wasteful number, since it uses less digits than its factorization.

6915313681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2069470.

The product of its digits is 116640, while the sum is 43.

The square root of 6915313681 is about 83158.3650693062. The cubic root of 6915313681 is about 1905.1856200205.

The spelling of 6915313681 in words is "six billion, nine hundred fifteen million, three hundred thirteen thousand, six hundred eighty-one".