64636121 has 4 divisors (see below), whose sum is σ = 70512144. Its totient is φ = 58760100.

The previous prime is 64636109. The next prime is 64636123. The reversal of 64636121 is 12163646.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-64636121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64636123) 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, 2937995 + ... + 2938016.

It is an arithmetic number, because the mean of its divisors is an integer number (17628036).

Almost surely, 2^64636121 is an apocalyptic number.

It is an amenable number.

64636121 is a deficient number, since it is larger than the sum of its proper divisors (5876023).

64636121 is a wasteful number, since it uses less digits than its factorization.

64636121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5876022.

The product of its digits is 5184, while the sum is 29.

The square root of 64636121 is about 8039.6592589487. The cubic root of 64636121 is about 401.3208854362.

Adding to 64636121 its reverse (12163646), we get a palindrome (76799767).

The spelling of 64636121 in words is "sixty-four million, six hundred thirty-six thousand, one hundred twenty-one".