51171257 has 2 divisors, whose sum is σ = 51171258. Its totient is φ = 51171256.

The previous prime is 51171229. The next prime is 51171271. The reversal of 51171257 is 75217115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32672656 + 18498601 = 5716^2 + 4301^2 .

It is a cyclic number.

It is not a de Polignac number, because 51171257 - 2⁶ = 51171193 is a prime.

It is not a weakly prime, because it can be changed into another prime (51171557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25585628 + 25585629.

It is an arithmetic number, because the mean of its divisors is an integer number (25585629).

Almost surely, 2^51171257 is an apocalyptic number.

It is an amenable number.

51171257 is a deficient number, since it is larger than the sum of its proper divisors (1).

51171257 is an equidigital number, since it uses as much as digits as its factorization.

51171257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2450, while the sum is 29.

The square root of 51171257 is about 7153.4087678533. The cubic root of 51171257 is about 371.2576076468.

The spelling of 51171257 in words is "fifty-one million, one hundred seventy-one thousand, two hundred fifty-seven".