51026813 has 2 divisors, whose sum is σ = 51026814. Its totient is φ = 51026812.

The previous prime is 51026803. The next prime is 51026839. The reversal of 51026813 is 31862015.

It is an a-pointer prime, because the next prime (51026839) can be obtained adding 51026813 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30713764 + 20313049 = 5542^2 + 4507^2 .

It is a cyclic number.

It is not a de Polignac number, because 51026813 - 2⁴ = 51026797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51026803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25513406 + 25513407.

It is an arithmetic number, because the mean of its divisors is an integer number (25513407).

Almost surely, 2^51026813 is an apocalyptic number.

It is an amenable number.

51026813 is a deficient number, since it is larger than the sum of its proper divisors (1).

51026813 is an equidigital number, since it uses as much as digits as its factorization.

51026813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 51026813 is about 7143.3054673589. The cubic root of 51026813 is about 370.9079551664.

Adding to 51026813 its reverse (31862015), we get a palindrome (82888828).

The spelling of 51026813 in words is "fifty-one million, twenty-six thousand, eight hundred thirteen".