64984181 has 2 divisors, whose sum is σ = 64984182. Its totient is φ = 64984180.

The previous prime is 64984159. The next prime is 64984187. The reversal of 64984181 is 18148946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38626225 + 26357956 = 6215^2 + 5134^2 .

It is a cyclic number.

It is not a de Polignac number, because 64984181 - 2¹⁰ = 64983157 is a prime.

It is a super-2 number, since 2×64984181² = 8445887560481522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64984187) 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, 32492090 + 32492091.

It is an arithmetic number, because the mean of its divisors is an integer number (32492091).

Almost surely, 2^64984181 is an apocalyptic number.

It is an amenable number.

64984181 is a deficient number, since it is larger than the sum of its proper divisors (1).

64984181 is an equidigital number, since it uses as much as digits as its factorization.

64984181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 41.

The square root of 64984181 is about 8061.2766358685. The cubic root of 64984181 is about 402.0399558480.

The spelling of 64984181 in words is "sixty-four million, nine hundred eighty-four thousand, one hundred eighty-one".