3128372909 has 2 divisors, whose sum is σ = 3128372910. Its totient is φ = 3128372908.

The previous prime is 3128372881. The next prime is 3128372953. The reversal of 3128372909 is 9092738213.

It is a happy number.

It is an a-pointer prime, because the next prime (3128372953) can be obtained adding 3128372909 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2738428900 + 389944009 = 52330^2 + 19747^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3128372909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3128372909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3128372609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1564186454 + 1564186455.

It is an arithmetic number, because the mean of its divisors is an integer number (1564186455).

Almost surely, 2^3128372909 is an apocalyptic number.

It is an amenable number.

3128372909 is a deficient number, since it is larger than the sum of its proper divisors (1).

3128372909 is an equidigital number, since it uses as much as digits as its factorization.

3128372909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 3128372909 is about 55931.8595167370. The cubic root of 3128372909 is about 1462.5346770846.

The spelling of 3128372909 in words is "three billion, one hundred twenty-eight million, three hundred seventy-two thousand, nine hundred nine".