64215331 has 2 divisors, whose sum is σ = 64215332. Its totient is φ = 64215330.

The previous prime is 64215329. The next prime is 64215343. The reversal of 64215331 is 13351246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64215331 - 2¹ = 64215329 is a prime.

It is a super-2 number, since 2×64215331² = 8247217470879122, which contains 22 as substring.

Together with 64215329, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 64215296 and 64215305.

It is not a weakly prime, because it can be changed into another prime (64015331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32107665 + 32107666.

It is an arithmetic number, because the mean of its divisors is an integer number (32107666).

Almost surely, 2^64215331 is an apocalyptic number.

64215331 is a deficient number, since it is larger than the sum of its proper divisors (1).

64215331 is an equidigital number, since it uses as much as digits as its factorization.

64215331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 25.

The square root of 64215331 is about 8013.4468863280. The cubic root of 64215331 is about 400.4481040694.

Adding to 64215331 its reverse (13351246), we get a palindrome (77566577).

It can be divided in two parts, 64215 and 331, that added together give a palindrome (64546).

The spelling of 64215331 in words is "sixty-four million, two hundred fifteen thousand, three hundred thirty-one".