6949680921 has 6 divisors (see below), whose sum is σ = 10038428010. Its totient is φ = 4633120608.

The previous prime is 6949680917. The next prime is 6949680961. The reversal of 6949680921 is 1290869496.

6949680921 is a `hidden beast` number, since 69 + 496 + 8 + 0 + 92 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5207787225 + 1741893696 = 72165^2 + 41736^2 .

It is not a de Polignac number, because 6949680921 - 2² = 6949680917 is a prime.

It is a super-2 number, since 2×6949680921² = 96596129807422816482, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6949680911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 386093376 + ... + 386093393.

It is an arithmetic number, because the mean of its divisors is an integer number (1673071335).

Almost surely, 2^6949680921 is an apocalyptic number.

It is an amenable number.

6949680921 is a deficient number, since it is larger than the sum of its proper divisors (3088747089).

6949680921 is a wasteful number, since it uses less digits than its factorization.

6949680921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772186775 (or 772186772 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The square root of 6949680921 is about 83364.7462720304. The cubic root of 6949680921 is about 1908.3364919830.

The spelling of 6949680921 in words is "six billion, nine hundred forty-nine million, six hundred eighty thousand, nine hundred twenty-one".