57555247 has 2 divisors, whose sum is σ = 57555248. Its totient is φ = 57555246.

The previous prime is 57555233. The next prime is 57555287. The reversal of 57555247 is 74255575.

It is an a-pointer prime, because the next prime (57555287) can be obtained adding 57555247 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57555247 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57555287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28777623 + 28777624.

It is an arithmetic number, because the mean of its divisors is an integer number (28777624).

Almost surely, 2^57555247 is an apocalyptic number.

57555247 is a deficient number, since it is larger than the sum of its proper divisors (1).

57555247 is an equidigital number, since it uses as much as digits as its factorization.

57555247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 245000, while the sum is 40.

The square root of 57555247 is about 7586.5174487376. The cubic root of 57555247 is about 386.0957081438.

The spelling of 57555247 in words is "fifty-seven million, five hundred fifty-five thousand, two hundred forty-seven".