56171257 has 2 divisors, whose sum is σ = 56171258. Its totient is φ = 56171256.

The previous prime is 56171243. The next prime is 56171261. The reversal of 56171257 is 75217165.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36288576 + 19882681 = 6024^2 + 4459^2 .

It is a cyclic number.

It is not a de Polignac number, because 56171257 - 2²³ = 47782649 is a prime.

It is a super-2 number, since 2×56171257² = 6310420225920098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (56171207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28085628 + 28085629.

It is an arithmetic number, because the mean of its divisors is an integer number (28085629).

Almost surely, 2^56171257 is an apocalyptic number.

It is an amenable number.

56171257 is a deficient number, since it is larger than the sum of its proper divisors (1).

56171257 is an equidigital number, since it uses as much as digits as its factorization.

56171257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14700, while the sum is 34.

The square root of 56171257 is about 7494.7486282063. The cubic root of 56171257 is about 382.9758430637.

The spelling of 56171257 in words is "fifty-six million, one hundred seventy-one thousand, two hundred fifty-seven".