51717251 has 2 divisors, whose sum is σ = 51717252. Its totient is φ = 51717250.

The previous prime is 51717229. The next prime is 51717287. The reversal of 51717251 is 15271715.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51717251 - 2⁶ = 51717187 is a prime.

It is not a weakly prime, because it can be changed into another prime (51717551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25858625 + 25858626.

It is an arithmetic number, because the mean of its divisors is an integer number (25858626).

Almost surely, 2^51717251 is an apocalyptic number.

51717251 is a deficient number, since it is larger than the sum of its proper divisors (1).

51717251 is an equidigital number, since it uses as much as digits as its factorization.

51717251 is an evil number, because the sum of its binary digits is even.

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

The square root of 51717251 is about 7191.4707118920. The cubic root of 51717251 is about 372.5733705301.

Adding to 51717251 its reverse (15271715), we get a palindrome (66988966).

The spelling of 51717251 in words is "fifty-one million, seven hundred seventeen thousand, two hundred fifty-one".