3091106721 has 24 divisors (see below), whose sum is σ = 4188323424. Its totient is φ = 2027773440.

The previous prime is 3091106699. The next prime is 3091106731. The reversal of 3091106721 is 1276011903.

3091106721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3091106721 - 2⁶ = 3091106657 is a prime.

It is a super-2 number, since 2×3091106721² = 19109881521222743682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3091106731) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9338526 + ... + 9338856.

It is an arithmetic number, because the mean of its divisors is an integer number (174513476).

Almost surely, 2^3091106721 is an apocalyptic number.

It is an amenable number.

3091106721 is a deficient number, since it is larger than the sum of its proper divisors (1097216703).

3091106721 is a wasteful number, since it uses less digits than its factorization.

3091106721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781 (or 654 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 3091106721 is about 55597.7222644957. The cubic root of 3091106721 is about 1456.7040683272.

The spelling of 3091106721 in words is "three billion, ninety-one million, one hundred six thousand, seven hundred twenty-one".