6247557397 has 2 divisors, whose sum is σ = 6247557398. Its totient is φ = 6247557396.

The previous prime is 6247557389. The next prime is 6247557427. The reversal of 6247557397 is 7937557426.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5572025316 + 675532081 = 74646^2 + 25991^2 .

It is a cyclic number.

It is not a de Polignac number, because 6247557397 - 2³ = 6247557389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6247557347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3123778698 + 3123778699.

It is an arithmetic number, because the mean of its divisors is an integer number (3123778699).

Almost surely, 2^6247557397 is an apocalyptic number.

It is an amenable number.

6247557397 is a deficient number, since it is larger than the sum of its proper divisors (1).

6247557397 is an equidigital number, since it uses as much as digits as its factorization.

6247557397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11113200, while the sum is 55.

The square root of 6247557397 is about 79041.4916167452. The cubic root of 6247557397 is about 1841.7757546824.

The spelling of 6247557397 in words is "six billion, two hundred forty-seven million, five hundred fifty-seven thousand, three hundred ninety-seven".