52009981 has 2 divisors, whose sum is σ = 52009982. Its totient is φ = 52009980.

The previous prime is 52009967. The next prime is 52009999. The reversal of 52009981 is 18990025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26101881 + 25908100 = 5109^2 + 5090^2 .

It is a cyclic number.

It is not a de Polignac number, because 52009981 - 2⁵ = 52009949 is a prime.

It is a super-2 number, since 2×52009981² = 5410076247240722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52009921) 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, 26004990 + 26004991.

It is an arithmetic number, because the mean of its divisors is an integer number (26004991).

Almost surely, 2^52009981 is an apocalyptic number.

It is an amenable number.

52009981 is a deficient number, since it is larger than the sum of its proper divisors (1).

52009981 is an equidigital number, since it uses as much as digits as its factorization.

52009981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 52009981 is about 7211.7945755547. The cubic root of 52009981 is about 373.2749950475.

The spelling of 52009981 in words is "fifty-two million, nine thousand, nine hundred eighty-one".