51017851 has 2 divisors, whose sum is σ = 51017852. Its totient is φ = 51017850.

The previous prime is 51017809. The next prime is 51017861. The reversal of 51017851 is 15871015.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51017851 - 2¹³ = 51009659 is a prime.

It is a super-2 number, since 2×51017851² = 5205642241316402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51017801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25508925 + 25508926.

It is an arithmetic number, because the mean of its divisors is an integer number (25508926).

Almost surely, 2^51017851 is an apocalyptic number.

51017851 is a deficient number, since it is larger than the sum of its proper divisors (1).

51017851 is an equidigital number, since it uses as much as digits as its factorization.

51017851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1400, while the sum is 28.

The square root of 51017851 is about 7142.6781391856. The cubic root of 51017851 is about 370.8862393172.

Adding to 51017851 its reverse (15871015), we get a palindrome (66888866).

The spelling of 51017851 in words is "fifty-one million, seventeen thousand, eight hundred fifty-one".