51805051 has 2 divisors, whose sum is σ = 51805052. Its totient is φ = 51805050.

The previous prime is 51804997. The next prime is 51805093. The reversal of 51805051 is 15050815.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51805051 - 2¹³ = 51796859 is a prime.

It is a super-2 number, since 2×51805051² = 5367526618225202, which contains 22 as substring.

It is equal to p_3102847 and since 51805051 and 3102847 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (51805651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25902525 + 25902526.

It is an arithmetic number, because the mean of its divisors is an integer number (25902526).

Almost surely, 2^51805051 is an apocalyptic number.

51805051 is a deficient number, since it is larger than the sum of its proper divisors (1).

51805051 is an equidigital number, since it uses as much as digits as its factorization.

51805051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1000, while the sum is 25.

The square root of 51805051 is about 7197.5725769179. The cubic root of 51805051 is about 372.7840896946.

Adding to 51805051 its reverse (15050815), we get a palindrome (66855866).

The spelling of 51805051 in words is "fifty-one million, eight hundred five thousand, fifty-one".