3121203649 has 2 divisors, whose sum is σ = 3121203650. Its totient is φ = 3121203648.

The previous prime is 3121203641. The next prime is 3121203691. The reversal of 3121203649 is 9463021213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2957184400 + 164019249 = 54380^2 + 12807^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121203649 - 2³ = 3121203641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3121203649.

It is not a weakly prime, because it can be changed into another prime (3121203641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560601824 + 1560601825.

It is an arithmetic number, because the mean of its divisors is an integer number (1560601825).

Almost surely, 2^3121203649 is an apocalyptic number.

It is an amenable number.

3121203649 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121203649 is an equidigital number, since it uses as much as digits as its factorization.

3121203649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 3121203649 is about 55867.7335230274. The cubic root of 3121203649 is about 1461.4165973292.

The spelling of 3121203649 in words is "three billion, one hundred twenty-one million, two hundred three thousand, six hundred forty-nine".