64542121 has 4 divisors (see below), whose sum is σ = 73762432. Its totient is φ = 55321812.

The previous prime is 64542113. The next prime is 64542133. The reversal of 64542121 is 12124546.

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 not a de Polignac number, because 64542121 - 2³ = 64542113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64512121) 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, 4610145 + ... + 4610158.

It is an arithmetic number, because the mean of its divisors is an integer number (18440608).

Almost surely, 2^64542121 is an apocalyptic number.

It is an amenable number.

64542121 is a deficient number, since it is larger than the sum of its proper divisors (9220311).

64542121 is an equidigital number, since it uses as much as digits as its factorization.

64542121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9220310.

The product of its digits is 1920, while the sum is 25.

The square root of 64542121 is about 8033.8111130397. The cubic root of 64542121 is about 401.1262447060.

Adding to 64542121 its reverse (12124546), we get a palindrome (76666667).

The spelling of 64542121 in words is "sixty-four million, five hundred forty-two thousand, one hundred twenty-one".