3109921657 has 4 divisors (see below), whose sum is σ = 3110037876. Its totient is φ = 3109805440.

The previous prime is 3109921649. The next prime is 3109921679. The reversal of 3109921657 is 7561299013.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 698227776 + 2411693881 = 26424^2 + 49109^2 .

It is a cyclic number.

It is not a de Polignac number, because 3109921657 - 2³ = 3109921649 is a prime.

It is a super-2 number, since 2×3109921657² = 19343225425355251298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3103921657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4557 + ... + 78997.

It is an arithmetic number, because the mean of its divisors is an integer number (777509469).

Almost surely, 2^3109921657 is an apocalyptic number.

It is an amenable number.

3109921657 is a deficient number, since it is larger than the sum of its proper divisors (116219).

3109921657 is an equidigital number, since it uses as much as digits as its factorization.

3109921657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116218.

The product of its (nonzero) digits is 102060, while the sum is 43.

The square root of 3109921657 is about 55766.6715610677. The cubic root of 3109921657 is about 1459.6536454010.

The spelling of 3109921657 in words is "three billion, one hundred nine million, nine hundred twenty-one thousand, six hundred fifty-seven".