7247321657 has 2 divisors, whose sum is σ = 7247321658. Its totient is φ = 7247321656.

The previous prime is 7247321621. The next prime is 7247321659. The reversal of 7247321657 is 7561237427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5825352976 + 1421968681 = 76324^2 + 37709^2 .

It is an emirp because it is prime and its reverse (7561237427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7247321657 - 2¹⁸ = 7247059513 is a prime.

Together with 7247321659, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7247321659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3623660828 + 3623660829.

It is an arithmetic number, because the mean of its divisors is an integer number (3623660829).

Almost surely, 2^7247321657 is an apocalyptic number.

It is an amenable number.

7247321657 is a deficient number, since it is larger than the sum of its proper divisors (1).

7247321657 is an equidigital number, since it uses as much as digits as its factorization.

7247321657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 493920, while the sum is 44.

The square root of 7247321657 is about 85131.2026051553. The cubic root of 7247321657 is about 1935.1999568128.

The spelling of 7247321657 in words is "seven billion, two hundred forty-seven million, three hundred twenty-one thousand, six hundred fifty-seven".