3121680667 has 4 divisors (see below), whose sum is σ = 3567635056. Its totient is φ = 2675726280.

The previous prime is 3121680659. The next prime is 3121680689. The reversal of 3121680667 is 7660861213.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7660861213 = 3251 ⋅2356463.

It is a cyclic number.

It is not a de Polignac number, because 3121680667 - 2³ = 3121680659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3121680467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222977184 + ... + 222977197.

It is an arithmetic number, because the mean of its divisors is an integer number (891908764).

Almost surely, 2^3121680667 is an apocalyptic number.

3121680667 is a deficient number, since it is larger than the sum of its proper divisors (445954389).

3121680667 is an equidigital number, since it uses as much as digits as its factorization.

3121680667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445954388.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 3121680667 is about 55872.0025325744. The cubic root of 3121680667 is about 1461.4910436636.

The spelling of 3121680667 in words is "three billion, one hundred twenty-one million, six hundred eighty thousand, six hundred sixty-seven".