3128742251 has 2 divisors, whose sum is σ = 3128742252. Its totient is φ = 3128742250.

The previous prime is 3128742247. The next prime is 3128742319. The reversal of 3128742251 is 1522478213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3128742251 - 2² = 3128742247 is a prime.

It is not a weakly prime, because it can be changed into another prime (3128742451) 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, 1564371125 + 1564371126.

It is an arithmetic number, because the mean of its divisors is an integer number (1564371126).

Almost surely, 2^3128742251 is an apocalyptic number.

3128742251 is a deficient number, since it is larger than the sum of its proper divisors (1).

3128742251 is an equidigital number, since it uses as much as digits as its factorization.

3128742251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 35.

The square root of 3128742251 is about 55935.1611332264. The cubic root of 3128742251 is about 1462.5922314152.

The spelling of 3128742251 in words is "three billion, one hundred twenty-eight million, seven hundred forty-two thousand, two hundred fifty-one".