64020631 has 2 divisors, whose sum is σ = 64020632. Its totient is φ = 64020630.

The previous prime is 64020599. The next prime is 64020641. The reversal of 64020631 is 13602046.

64020631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64020631 - 2⁵ = 64020599 is a prime.

It is a super-2 number, since 2×64020631² = 8197282387276322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64020641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32010315 + 32010316.

It is an arithmetic number, because the mean of its divisors is an integer number (32010316).

Almost surely, 2^64020631 is an apocalyptic number.

64020631 is a deficient number, since it is larger than the sum of its proper divisors (1).

64020631 is an equidigital number, since it uses as much as digits as its factorization.

64020631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 64020631 is about 8001.2893336012. The cubic root of 64020631 is about 400.0429766324.

Adding to 64020631 its reverse (13602046), we get a palindrome (77622677).

The spelling of 64020631 in words is "sixty-four million, twenty thousand, six hundred thirty-one".