51758981 has 2 divisors, whose sum is σ = 51758982. Its totient is φ = 51758980.

The previous prime is 51758957. The next prime is 51759023. The reversal of 51758981 is 18985715.

It is a happy number.

51758981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39262756 + 12496225 = 6266^2 + 3535^2 .

It is a cyclic number.

It is not a de Polignac number, because 51758981 - 2¹⁴ = 51742597 is a prime.

It is a super-2 number, since 2×51758981² = 5357984228316722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51758911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25879490 + 25879491.

It is an arithmetic number, because the mean of its divisors is an integer number (25879491).

Almost surely, 2^51758981 is an apocalyptic number.

It is an amenable number.

51758981 is a deficient number, since it is larger than the sum of its proper divisors (1).

51758981 is an equidigital number, since it uses as much as digits as its factorization.

51758981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 44.

The square root of 51758981 is about 7194.3714805395. The cubic root of 51758981 is about 372.6735518470.

The spelling of 51758981 in words is "fifty-one million, seven hundred fifty-eight thousand, nine hundred eighty-one".