64189649 has 2 divisors, whose sum is σ = 64189650. Its totient is φ = 64189648.

The previous prime is 64189613. The next prime is 64189661. The reversal of 64189649 is 94698146.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60217600 + 3972049 = 7760^2 + 1993^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64189649 is a prime.

It is a super-2 number, since 2×64189649² = 8240622077486402, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64189679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32094824 + 32094825.

It is an arithmetic number, because the mean of its divisors is an integer number (32094825).

Almost surely, 2^64189649 is an apocalyptic number.

It is an amenable number.

64189649 is a deficient number, since it is larger than the sum of its proper divisors (1).

64189649 is an equidigital number, since it uses as much as digits as its factorization.

64189649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 47.

The square root of 64189649 is about 8011.8442945429. The cubic root of 64189649 is about 400.3947124604.

The spelling of 64189649 in words is "sixty-four million, one hundred eighty-nine thousand, six hundred forty-nine".