51652781 has 2 divisors, whose sum is σ = 51652782. Its totient is φ = 51652780.

The previous prime is 51652771. The next prime is 51652801. The reversal of 51652781 is 18725615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49477156 + 2175625 = 7034^2 + 1475^2 .

It is a cyclic number.

It is not a de Polignac number, because 51652781 - 2¹⁰ = 51651757 is a prime.

It is a super-2 number, since 2×51652781² = 5336019570067922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51652751) 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, 25826390 + 25826391.

It is an arithmetic number, because the mean of its divisors is an integer number (25826391).

Almost surely, 2^51652781 is an apocalyptic number.

It is an amenable number.

51652781 is a deficient number, since it is larger than the sum of its proper divisors (1).

51652781 is an equidigital number, since it uses as much as digits as its factorization.

51652781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16800, while the sum is 35.

The square root of 51652781 is about 7186.9869208174. The cubic root of 51652781 is about 372.4184912421.

The spelling of 51652781 in words is "fifty-one million, six hundred fifty-two thousand, seven hundred eighty-one".