51826681 has 2 divisors, whose sum is σ = 51826682. Its totient is φ = 51826680.

The previous prime is 51826657. The next prime is 51826729. The reversal of 51826681 is 18662815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39576681 + 12250000 = 6291^2 + 3500^2 .

It is a cyclic number.

It is not a de Polignac number, because 51826681 - 2⁷ = 51826553 is a prime.

It is a super-2 number, since 2×51826681² = 5372009726951522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51826681.

It is not a weakly prime, because it can be changed into another prime (51827681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25913340 + 25913341.

It is an arithmetic number, because the mean of its divisors is an integer number (25913341).

Almost surely, 2^51826681 is an apocalyptic number.

It is an amenable number.

51826681 is a deficient number, since it is larger than the sum of its proper divisors (1).

51826681 is an equidigital number, since it uses as much as digits as its factorization.

51826681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 37.

The square root of 51826681 is about 7199.0750100273. The cubic root of 51826681 is about 372.8359649316.

The spelling of 51826681 in words is "fifty-one million, eight hundred twenty-six thousand, six hundred eighty-one".