64840121 has 4 divisors (see below), whose sum is σ = 65807952. Its totient is φ = 63872292.

The previous prime is 64840109. The next prime is 64840123. The reversal of 64840121 is 12104846.

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 64840121 - 2¹⁰ = 64839097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64840123) 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, 483815 + ... + 483948.

It is an arithmetic number, because the mean of its divisors is an integer number (16451988).

Almost surely, 2^64840121 is an apocalyptic number.

It is an amenable number.

64840121 is a deficient number, since it is larger than the sum of its proper divisors (967831).

64840121 is an equidigital number, since it uses as much as digits as its factorization.

64840121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 967830.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 64840121 is about 8052.3363690298. The cubic root of 64840121 is about 401.7426489943.

Adding to 64840121 its reverse (12104846), we get a palindrome (76944967).

The spelling of 64840121 in words is "sixty-four million, eight hundred forty thousand, one hundred twenty-one".