64312121 has 4 divisors (see below), whose sum is σ = 65680512. Its totient is φ = 62943732.

The previous prime is 64312097. The next prime is 64312123. The reversal of 64312121 is 12121346.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64312121 - 2⁶ = 64312057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64312093 and 64312102.

It is not an unprimeable number, because it can be changed into a prime (64312123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 684125 + ... + 684218.

It is an arithmetic number, because the mean of its divisors is an integer number (16420128).

Almost surely, 2^64312121 is an apocalyptic number.

It is an amenable number.

64312121 is a deficient number, since it is larger than the sum of its proper divisors (1368391).

64312121 is a wasteful number, since it uses less digits than its factorization.

64312121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368390.

The product of its digits is 288, while the sum is 20.

The square root of 64312121 is about 8019.4838362578. The cubic root of 64312121 is about 400.6491978686.

Adding to 64312121 its reverse (12121346), we get a palindrome (76433467).

The spelling of 64312121 in words is "sixty-four million, three hundred twelve thousand, one hundred twenty-one".