8457256397 has 2 divisors, whose sum is σ = 8457256398. Its totient is φ = 8457256396.

The previous prime is 8457256387. The next prime is 8457256589. The reversal of 8457256397 is 7936527548.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5630101156 + 2827155241 = 75034^2 + 53171^2 .

It is a cyclic number.

It is not a de Polignac number, because 8457256397 - 2¹⁸ = 8456994253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8457256337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4228628198 + 4228628199.

It is an arithmetic number, because the mean of its divisors is an integer number (4228628199).

Almost surely, 2^8457256397 is an apocalyptic number.

It is an amenable number.

8457256397 is a deficient number, since it is larger than the sum of its proper divisors (1).

8457256397 is an equidigital number, since it uses as much as digits as its factorization.

8457256397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12700800, while the sum is 56.

The square root of 8457256397 is about 91963.3426806573. The cubic root of 8457256397 is about 2037.4009253492.

The spelling of 8457256397 in words is "eight billion, four hundred fifty-seven million, two hundred fifty-six thousand, three hundred ninety-seven".