7121144257 has 2 divisors, whose sum is σ = 7121144258. Its totient is φ = 7121144256.

The previous prime is 7121144221. The next prime is 7121144281. The reversal of 7121144257 is 7524411217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6543030321 + 578113936 = 80889^2 + 24044^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7121144257 is a prime.

It is not a weakly prime, because it can be changed into another prime (7121144207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3560572128 + 3560572129.

It is an arithmetic number, because the mean of its divisors is an integer number (3560572129).

Almost surely, 2^7121144257 is an apocalyptic number.

It is an amenable number.

7121144257 is a deficient number, since it is larger than the sum of its proper divisors (1).

7121144257 is an equidigital number, since it uses as much as digits as its factorization.

7121144257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15680, while the sum is 34.

The square root of 7121144257 is about 84386.8725395129. The cubic root of 7121144257 is about 1923.9033958416.

The spelling of 7121144257 in words is "seven billion, one hundred twenty-one million, one hundred forty-four thousand, two hundred fifty-seven".