64531109 has 2 divisors, whose sum is σ = 64531110. Its totient is φ = 64531108.

The previous prime is 64531097. The next prime is 64531151. The reversal of 64531109 is 90113546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63760225 + 770884 = 7985^2 + 878^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64531109 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64533109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32265554 + 32265555.

It is an arithmetic number, because the mean of its divisors is an integer number (32265555).

Almost surely, 2^64531109 is an apocalyptic number.

It is an amenable number.

64531109 is a deficient number, since it is larger than the sum of its proper divisors (1).

64531109 is an equidigital number, since it uses as much as digits as its factorization.

64531109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 64531109 is about 8033.1257303742. The cubic root of 64531109 is about 401.1034303878.

The spelling of 64531109 in words is "sixty-four million, five hundred thirty-one thousand, one hundred nine".