64423861 has 2 divisors, whose sum is σ = 64423862. Its totient is φ = 64423860.

The previous prime is 64423817. The next prime is 64423907. The reversal of 64423861 is 16832446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34928100 + 29495761 = 5910^2 + 5431^2 .

It is a cyclic number.

It is not a de Polignac number, because 64423861 - 2⁹ = 64423349 is a prime.

It is a super-2 number, since 2×64423861² = 8300867732294642, which contains 22 as substring.

It is equal to p_3808681 and since 64423861 and 3808681 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64423061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32211930 + 32211931.

It is an arithmetic number, because the mean of its divisors is an integer number (32211931).

Almost surely, 2^64423861 is an apocalyptic number.

It is an amenable number.

64423861 is a deficient number, since it is larger than the sum of its proper divisors (1).

64423861 is an equidigital number, since it uses as much as digits as its factorization.

64423861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 34.

The square root of 64423861 is about 8026.4475952939. The cubic root of 64423861 is about 400.8811014754.

The spelling of 64423861 in words is "sixty-four million, four hundred twenty-three thousand, eight hundred sixty-one".