51261773 has 2 divisors, whose sum is σ = 51261774. Its totient is φ = 51261772.

The previous prime is 51261751. The next prime is 51261781. The reversal of 51261773 is 37716215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26081449 + 25180324 = 5107^2 + 5018^2 .

It is a cyclic number.

It is not a de Polignac number, because 51261773 - 2⁶ = 51261709 is a prime.

It is a super-2 number, since 2×51261773² = 5255538742207058, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51261703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25630886 + 25630887.

It is an arithmetic number, because the mean of its divisors is an integer number (25630887).

Almost surely, 2^51261773 is an apocalyptic number.

It is an amenable number.

51261773 is a deficient number, since it is larger than the sum of its proper divisors (1).

51261773 is an equidigital number, since it uses as much as digits as its factorization.

51261773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8820, while the sum is 32.

The square root of 51261773 is about 7159.7327464089. The cubic root of 51261773 is about 371.4763825394.

Adding to 51261773 its reverse (37716215), we get a palindrome (88977988).

The spelling of 51261773 in words is "fifty-one million, two hundred sixty-one thousand, seven hundred seventy-three".