52218401 has 2 divisors, whose sum is σ = 52218402. Its totient is φ = 52218400.

The previous prime is 52218343. The next prime is 52218449. The reversal of 52218401 is 10481225.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51136801 + 1081600 = 7151^2 + 1040^2 .

It is a cyclic number.

It is not a de Polignac number, because 52218401 - 2⁶ = 52218337 is a prime.

It is a super-2 number, since 2×52218401² = 5453522805993602, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (52218701) 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, 26109200 + 26109201.

It is an arithmetic number, because the mean of its divisors is an integer number (26109201).

Almost surely, 2^52218401 is an apocalyptic number.

It is an amenable number.

52218401 is a deficient number, since it is larger than the sum of its proper divisors (1).

52218401 is an equidigital number, since it uses as much as digits as its factorization.

52218401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 52218401 is about 7226.2300682998. The cubic root of 52218401 is about 373.7729397597.

Adding to 52218401 its reverse (10481225), we get a palindrome (62699626).

The spelling of 52218401 in words is "fifty-two million, two hundred eighteen thousand, four hundred one".