51897930881 has 2 divisors, whose sum is σ = 51897930882. Its totient is φ = 51897930880.

The previous prime is 51897930863. The next prime is 51897930899. The reversal of 51897930881 is 18803979815.

It is a balanced prime because it is at equal distance from previous prime (51897930863) and next prime (51897930899).

It can be written as a sum of positive squares in only one way, i.e., 32342425600 + 19555505281 = 179840^2 + 139841^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51897930881 is a prime.

It is a super-2 number, since 2×51897930881² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51897930881.

It is not a weakly prime, because it can be changed into another prime (51897930281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25948965440 + 25948965441.

It is an arithmetic number, because the mean of its divisors is an integer number (25948965441).

Almost surely, 2^51897930881 is an apocalyptic number.

It is an amenable number.

51897930881 is a deficient number, since it is larger than the sum of its proper divisors (1).

51897930881 is an equidigital number, since it uses as much as digits as its factorization.

51897930881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4354560, while the sum is 59.

The spelling of 51897930881 in words is "fifty-one billion, eight hundred ninety-seven million, nine hundred thirty thousand, eight hundred eighty-one".