64942121 has 4 divisors (see below), whose sum is σ = 64958292. Its totient is φ = 64925952.

The previous prime is 64942099. The next prime is 64942147. The reversal of 64942121 is 12124946.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 12524521 + 52417600 = 3539^2 + 7240^2 .

It is a cyclic number.

It is not a de Polignac number, because 64942121 - 2¹⁸ = 64679977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64942151) 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, 3065 + ... + 11801.

It is an arithmetic number, because the mean of its divisors is an integer number (16239573).

Almost surely, 2^64942121 is an apocalyptic number.

It is an amenable number.

64942121 is a deficient number, since it is larger than the sum of its proper divisors (16171).

64942121 is an equidigital number, since it uses as much as digits as its factorization.

64942121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16170.

The product of its digits is 3456, while the sum is 29.

The square root of 64942121 is about 8058.6674456761. The cubic root of 64942121 is about 401.9531990928.

The spelling of 64942121 in words is "sixty-four million, nine hundred forty-two thousand, one hundred twenty-one".