64631761 has 2 divisors, whose sum is σ = 64631762. Its totient is φ = 64631760.

The previous prime is 64631759. The next prime is 64631767. The reversal of 64631761 is 16713646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38825361 + 25806400 = 6231^2 + 5080^2 .

It is a cyclic number.

It is not a de Polignac number, because 64631761 - 2¹ = 64631759 is a prime.

It is a super-2 number, since 2×64631761² = 8354529059922242, which contains 22 as substring.

Together with 64631759, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (64631767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32315880 + 32315881.

It is an arithmetic number, because the mean of its divisors is an integer number (32315881).

Almost surely, 2^64631761 is an apocalyptic number.

It is an amenable number.

64631761 is a deficient number, since it is larger than the sum of its proper divisors (1).

64631761 is an equidigital number, since it uses as much as digits as its factorization.

64631761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 34.

The square root of 64631761 is about 8039.3880986055. The cubic root of 64631761 is about 401.3118615944.

The spelling of 64631761 in words is "sixty-four million, six hundred thirty-one thousand, seven hundred sixty-one".