3091091621 has 2 divisors, whose sum is σ = 3091091622. Its totient is φ = 3091091620.

The previous prime is 3091091581. The next prime is 3091091659. The reversal of 3091091621 is 1261901903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3089803396 + 1288225 = 55586^2 + 1135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3091091621 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3091091671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1545545810 + 1545545811.

It is an arithmetic number, because the mean of its divisors is an integer number (1545545811).

Almost surely, 2^3091091621 is an apocalyptic number.

It is an amenable number.

3091091621 is a deficient number, since it is larger than the sum of its proper divisors (1).

3091091621 is an equidigital number, since it uses as much as digits as its factorization.

3091091621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 3091091621 is about 55597.5864673998. The cubic root of 3091091621 is about 1456.7016963324.

The spelling of 3091091621 in words is "three billion, ninety-one million, ninety-one thousand, six hundred twenty-one".