64231009 has 4 divisors (see below), whose sum is σ = 64247040. Its totient is φ = 64214980.

The previous prime is 64230997. The next prime is 64231061. The reversal of 64231009 is 90013246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90013246 = 2 ⋅45006623.

It is a cyclic number.

It is not a de Polignac number, because 64231009 - 2⁹ = 64230497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64231309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3864 + ... + 11974.

It is an arithmetic number, because the mean of its divisors is an integer number (16061760).

Almost surely, 2^64231009 is an apocalyptic number.

It is an amenable number.

64231009 is a deficient number, since it is larger than the sum of its proper divisors (16031).

64231009 is an equidigital number, since it uses as much as digits as its factorization.

64231009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16030.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 64231009 is about 8014.4250573575. The cubic root of 64231009 is about 400.4806908593.

The spelling of 64231009 in words is "sixty-four million, two hundred thirty-one thousand, nine".