51290257 has 2 divisors, whose sum is σ = 51290258. Its totient is φ = 51290256.

The previous prime is 51290243. The next prime is 51290263. The reversal of 51290257 is 75209215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28259856 + 23030401 = 5316^2 + 4799^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51290257 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51290227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25645128 + 25645129.

It is an arithmetic number, because the mean of its divisors is an integer number (25645129).

Almost surely, 2^51290257 is an apocalyptic number.

It is an amenable number.

51290257 is a deficient number, since it is larger than the sum of its proper divisors (1).

51290257 is an equidigital number, since it uses as much as digits as its factorization.

51290257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 51290257 is about 7161.7216505530. The cubic root of 51290257 is about 371.5451743729.

The spelling of 51290257 in words is "fifty-one million, two hundred ninety thousand, two hundred fifty-seven".