51756251 has 2 divisors, whose sum is σ = 51756252. Its totient is φ = 51756250.

The previous prime is 51756223. The next prime is 51756253. The reversal of 51756251 is 15265715.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51756251 is a prime.

Together with 51756253, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51756253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25878125 + 25878126.

It is an arithmetic number, because the mean of its divisors is an integer number (25878126).

Almost surely, 2^51756251 is an apocalyptic number.

51756251 is a deficient number, since it is larger than the sum of its proper divisors (1).

51756251 is an equidigital number, since it uses as much as digits as its factorization.

51756251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10500, while the sum is 32.

The square root of 51756251 is about 7194.1817463837. The cubic root of 51756251 is about 372.6669995755. Note that the first 3 decimals are identical.

The spelling of 51756251 in words is "fifty-one million, seven hundred fifty-six thousand, two hundred fifty-one".