52699981 has 2 divisors, whose sum is σ = 52699982. Its totient is φ = 52699980.

The previous prime is 52699979. The next prime is 52699987. The reversal of 52699981 is 18999625.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28355625 + 24344356 = 5325^2 + 4934^2 .

It is a cyclic number.

It is not a de Polignac number, because 52699981 - 2¹ = 52699979 is a prime.

It is a super-2 number, since 2×52699981² = 5554575994800722, which contains 22 as substring.

Together with 52699979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52699987) 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, 26349990 + 26349991.

It is an arithmetic number, because the mean of its divisors is an integer number (26349991).

Almost surely, 2^52699981 is an apocalyptic number.

It is an amenable number.

52699981 is a deficient number, since it is larger than the sum of its proper divisors (1).

52699981 is an equidigital number, since it uses as much as digits as its factorization.

52699981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 49.

The square root of 52699981 is about 7259.4752565182. The cubic root of 52699981 is about 374.9184557509.

The spelling of 52699981 in words is "fifty-two million, six hundred ninety-nine thousand, nine hundred eighty-one".