64921051 has 16 divisors (see below), whose sum is σ = 72854208. Its totient is φ = 57456000.

The previous prime is 64921009. The next prime is 64921067. The reversal of 64921051 is 15012946.

It is a cyclic number.

It is not a de Polignac number, because 64921051 - 2⁹ = 64920539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64921151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33201 + ... + 35101.

It is an arithmetic number, because the mean of its divisors is an integer number (4553388).

Almost surely, 2^64921051 is an apocalyptic number.

64921051 is a deficient number, since it is larger than the sum of its proper divisors (7933157).

64921051 is a wasteful number, since it uses less digits than its factorization.

64921051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2022.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 64921051 is about 8057.3600515305. The cubic root of 64921051 is about 401.9097241243.

Adding to 64921051 its reverse (15012946), we get a palindrome (79933997).

The spelling of 64921051 in words is "sixty-four million, nine hundred twenty-one thousand, fifty-one".