3121735649 has 2 divisors, whose sum is σ = 3121735650. Its totient is φ = 3121735648.

The previous prime is 3121735637. The next prime is 3121735691. The reversal of 3121735649 is 9465371213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2505703249 + 616032400 = 50057^2 + 24820^2 .

It is an emirp because it is prime and its reverse (9465371213) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3121735649 is a prime.

It is not a weakly prime, because it can be changed into another prime (3121735249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560867824 + 1560867825.

It is an arithmetic number, because the mean of its divisors is an integer number (1560867825).

Almost surely, 2^3121735649 is an apocalyptic number.

It is an amenable number.

3121735649 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121735649 is an equidigital number, since it uses as much as digits as its factorization.

3121735649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 41.

The square root of 3121735649 is about 55872.4945657521. The cubic root of 3121735649 is about 1461.4996240019.

It can be divided in two parts, 31217 and 35649, that added together give a palindrome (66866).

The spelling of 3121735649 in words is "three billion, one hundred twenty-one million, seven hundred thirty-five thousand, six hundred forty-nine".