64231649 has 2 divisors, whose sum is σ = 64231650. Its totient is φ = 64231648.

The previous prime is 64231633. The next prime is 64231679. The reversal of 64231649 is 94613246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58140625 + 6091024 = 7625^2 + 2468^2 .

It is a cyclic number.

It is not a de Polignac number, because 64231649 - 2⁴ = 64231633 is a prime.

It is not a weakly prime, because it can be changed into another prime (64231619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32115824 + 32115825.

It is an arithmetic number, because the mean of its divisors is an integer number (32115825).

Almost surely, 2^64231649 is an apocalyptic number.

It is an amenable number.

64231649 is a deficient number, since it is larger than the sum of its proper divisors (1).

64231649 is an equidigital number, since it uses as much as digits as its factorization.

64231649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 35.

The square root of 64231649 is about 8014.4649852626. The cubic root of 64231649 is about 400.4820209894.

The spelling of 64231649 in words is "sixty-four million, two hundred thirty-one thousand, six hundred forty-nine".