51069881 has 2 divisors, whose sum is σ = 51069882. Its totient is φ = 51069880.

The previous prime is 51069857. The next prime is 51069911. The reversal of 51069881 is 18896015.

51069881 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., 27206656 + 23863225 = 5216^2 + 4885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51069881 is a prime.

It is a super-2 number, since 2×51069881² = 5216265490708322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51069181) 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, 25534940 + 25534941.

It is an arithmetic number, because the mean of its divisors is an integer number (25534941).

Almost surely, 2^51069881 is an apocalyptic number.

It is an amenable number.

51069881 is a deficient number, since it is larger than the sum of its proper divisors (1).

51069881 is an equidigital number, since it uses as much as digits as its factorization.

51069881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 51069881 is about 7146.3194023217. The cubic root of 51069881 is about 371.0122779119.

The spelling of 51069881 in words is "fifty-one million, sixty-nine thousand, eight hundred eighty-one".