51170881 has 2 divisors, whose sum is σ = 51170882. Its totient is φ = 51170880.

The previous prime is 51170879. The next prime is 51170891. The reversal of 51170881 is 18807115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44622400 + 6548481 = 6680^2 + 2559^2 .

It is a cyclic number.

It is not a de Polignac number, because 51170881 - 2¹ = 51170879 is a prime.

It is a super-2 number, since 2×51170881² = 5236918124632322, which contains 22 as substring.

Together with 51170879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51170831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25585440 + 25585441.

It is an arithmetic number, because the mean of its divisors is an integer number (25585441).

Almost surely, 2^51170881 is an apocalyptic number.

It is an amenable number.

51170881 is a deficient number, since it is larger than the sum of its proper divisors (1).

51170881 is an equidigital number, since it uses as much as digits as its factorization.

51170881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 31.

The square root of 51170881 is about 7153.3824866283. The cubic root of 51170881 is about 371.2566983264.

Adding to 51170881 its reverse (18807115), we get a palindrome (69977996).

The spelling of 51170881 in words is "fifty-one million, one hundred seventy thousand, eight hundred eighty-one".