64532381 has 2 divisors, whose sum is σ = 64532382. Its totient is φ = 64532380.

The previous prime is 64532353. The next prime is 64532389. The reversal of 64532381 is 18323546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55741156 + 8791225 = 7466^2 + 2965^2 .

It is a cyclic number.

It is not a de Polignac number, because 64532381 - 2¹⁸ = 64270237 is a prime.

It is a super-2 number, since 2×64532381² = 8328856395058322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64532389) 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, 32266190 + 32266191.

It is an arithmetic number, because the mean of its divisors is an integer number (32266191).

Almost surely, 2^64532381 is an apocalyptic number.

It is an amenable number.

64532381 is a deficient number, since it is larger than the sum of its proper divisors (1).

64532381 is an equidigital number, since it uses as much as digits as its factorization.

64532381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 32.

The square root of 64532381 is about 8033.2049021546. The cubic root of 64532381 is about 401.1060658103.

The spelling of 64532381 in words is "sixty-four million, five hundred thirty-two thousand, three hundred eighty-one".