64521031 has 2 divisors, whose sum is σ = 64521032. Its totient is φ = 64521030.

The previous prime is 64521029. The next prime is 64521047. The reversal of 64521031 is 13012546.

64521031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64521031 - 2¹ = 64521029 is a prime.

It is a super-2 number, since 2×64521031² = 8325926882605922, which contains 22 as substring.

Together with 64521029, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 64520993 and 64521011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64521071) 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, 32260515 + 32260516.

It is an arithmetic number, because the mean of its divisors is an integer number (32260516).

Almost surely, 2^64521031 is an apocalyptic number.

64521031 is a deficient number, since it is larger than the sum of its proper divisors (1).

64521031 is an equidigital number, since it uses as much as digits as its factorization.

64521031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 64521031 is about 8032.4984282600. The cubic root of 64521031 is about 401.0825488271.

Adding to 64521031 its reverse (13012546), we get a palindrome (77533577).

The spelling of 64521031 in words is "sixty-four million, five hundred twenty-one thousand, thirty-one".