64386181 has 2 divisors, whose sum is σ = 64386182. Its totient is φ = 64386180.

The previous prime is 64386173. The next prime is 64386199. The reversal of 64386181 is 18168346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61873956 + 2512225 = 7866^2 + 1585^2 .

It is a cyclic number.

It is not a de Polignac number, because 64386181 - 2³ = 64386173 is a prime.

It is a super-2 number, since 2×64386181² = 8291160607529522, which contains 22 as substring.

It is a Chen prime.

It is equal to p_3806578 and since 64386181 and 3806578 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64386181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64386281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32193090 + 32193091.

It is an arithmetic number, because the mean of its divisors is an integer number (32193091).

Almost surely, 2^64386181 is an apocalyptic number.

It is an amenable number.

64386181 is a deficient number, since it is larger than the sum of its proper divisors (1).

64386181 is an equidigital number, since it uses as much as digits as its factorization.

64386181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 37.

The square root of 64386181 is about 8024.1000118393. The cubic root of 64386181 is about 400.8029309264.

The spelling of 64386181 in words is "sixty-four million, three hundred eighty-six thousand, one hundred eighty-one".