64812691 has 2 divisors, whose sum is σ = 64812692. Its totient is φ = 64812690.

The previous prime is 64812637. The next prime is 64812697. The reversal of 64812691 is 19621846.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64812691 - 2⁹ = 64812179 is a prime.

It is a super-2 number, since 2×64812691² = 8401369829322962, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64812691.

It is not a weakly prime, because it can be changed into another prime (64812697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32406345 + 32406346.

It is an arithmetic number, because the mean of its divisors is an integer number (32406346).

Almost surely, 2^64812691 is an apocalyptic number.

64812691 is a deficient number, since it is larger than the sum of its proper divisors (1).

64812691 is an equidigital number, since it uses as much as digits as its factorization.

64812691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 64812691 is about 8050.6329564824. The cubic root of 64812691 is about 401.6859898610.

The spelling of 64812691 in words is "sixty-four million, eight hundred twelve thousand, six hundred ninety-one".