51758381 has 2 divisors, whose sum is σ = 51758382. Its totient is φ = 51758380.

The previous prime is 51758363. The next prime is 51758389. The reversal of 51758381 is 18385715.

51758381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48302500 + 3455881 = 6950^2 + 1859^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51758381 is a prime.

It is a super-2 number, since 2×51758381² = 5357860007482322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51758389) 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, 25879190 + 25879191.

It is an arithmetic number, because the mean of its divisors is an integer number (25879191).

Almost surely, 2^51758381 is an apocalyptic number.

It is an amenable number.

51758381 is a deficient number, since it is larger than the sum of its proper divisors (1).

51758381 is an equidigital number, since it uses as much as digits as its factorization.

51758381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33600, while the sum is 38.

The square root of 51758381 is about 7194.3297811540. The cubic root of 51758381 is about 372.6721118071.

The spelling of 51758381 in words is "fifty-one million, seven hundred fifty-eight thousand, three hundred eighty-one".