64938121 has 4 divisors (see below), whose sum is σ = 65720592. Its totient is φ = 64155652.

The previous prime is 64938077. The next prime is 64938151. The reversal of 64938121 is 12183946.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12183946 = 2 ⋅6091973.

It is a cyclic number.

It is not a de Polignac number, because 64938121 - 2¹⁵ = 64905353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64938151) 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, 391111 + ... + 391276.

It is an arithmetic number, because the mean of its divisors is an integer number (16430148).

Almost surely, 2^64938121 is an apocalyptic number.

It is an amenable number.

64938121 is a deficient number, since it is larger than the sum of its proper divisors (782471).

64938121 is an equidigital number, since it uses as much as digits as its factorization.

64938121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782470.

The product of its digits is 10368, while the sum is 34.

The square root of 64938121 is about 8058.4192618652. The cubic root of 64938121 is about 401.9449463811.

The spelling of 64938121 in words is "sixty-four million, nine hundred thirty-eight thousand, one hundred twenty-one".