3105517421 has 2 divisors, whose sum is σ = 3105517422. Its totient is φ = 3105517420.

The previous prime is 3105517409. The next prime is 3105517423. The reversal of 3105517421 is 1247155013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2254920196 + 850597225 = 47486^2 + 29165^2 .

It is a cyclic number.

It is not a de Polignac number, because 3105517421 - 2⁶ = 3105517357 is a prime.

Together with 3105517423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3105517423) 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 as a sum of consecutive naturals, namely, 1552758710 + 1552758711.

It is an arithmetic number, because the mean of its divisors is an integer number (1552758711).

Almost surely, 2^3105517421 is an apocalyptic number.

It is an amenable number.

3105517421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3105517421 is an equidigital number, since it uses as much as digits as its factorization.

3105517421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 3105517421 is about 55727.1695046501. The cubic root of 3105517421 is about 1458.9642715235.

The spelling of 3105517421 in words is "three billion, one hundred five million, five hundred seventeen thousand, four hundred twenty-one".