3128721367 has 2 divisors, whose sum is σ = 3128721368. Its totient is φ = 3128721366.

The previous prime is 3128721353. The next prime is 3128721373. The reversal of 3128721367 is 7631278213.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3128721367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3128721467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1564360683 + 1564360684.

It is an arithmetic number, because the mean of its divisors is an integer number (1564360684).

Almost surely, 2^3128721367 is an apocalyptic number.

3128721367 is a deficient number, since it is larger than the sum of its proper divisors (1).

3128721367 is an equidigital number, since it uses as much as digits as its factorization.

3128721367 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 40.

The square root of 3128721367 is about 55934.9744524837. The cubic root of 3128721367 is about 1462.5889771955.

The spelling of 3128721367 in words is "three billion, one hundred twenty-eight million, seven hundred twenty-one thousand, three hundred sixty-seven".