64465381 has 2 divisors, whose sum is σ = 64465382. Its totient is φ = 64465380.

The previous prime is 64465369. The next prime is 64465393. The reversal of 64465381 is 18356446.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (64465369) and next prime (64465393).

It can be written as a sum of positive squares in only one way, i.e., 35402500 + 29062881 = 5950^2 + 5391^2 .

It is a cyclic number.

It is not a de Polignac number, because 64465381 - 2¹³ = 64457189 is a prime.

It is a super-2 number, since 2×64465381² = 8311570694950322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64465381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64465301) 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, 32232690 + 32232691.

It is an arithmetic number, because the mean of its divisors is an integer number (32232691).

Almost surely, 2^64465381 is an apocalyptic number.

It is an amenable number.

64465381 is a deficient number, since it is larger than the sum of its proper divisors (1).

64465381 is an equidigital number, since it uses as much as digits as its factorization.

64465381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 37.

The square root of 64465381 is about 8029.0336280277. The cubic root of 64465381 is about 400.9672031601.

It can be divided in two parts, 64465 and 381, that added together give a palindrome (64846).

The spelling of 64465381 in words is "sixty-four million, four hundred sixty-five thousand, three hundred eighty-one".