64919291 has 4 divisors (see below), whose sum is σ = 65493912. Its totient is φ = 64344672.

The previous prime is 64919269. The next prime is 64919297. The reversal of 64919291 is 19291946.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64919291 - 2⁶ = 64919227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64919297) 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 3 ways as a sum of consecutive naturals, for example, 287141 + ... + 287366.

It is an arithmetic number, because the mean of its divisors is an integer number (16373478).

Almost surely, 2^64919291 is an apocalyptic number.

64919291 is a deficient number, since it is larger than the sum of its proper divisors (574621).

64919291 is a wasteful number, since it uses less digits than its factorization.

64919291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574620.

The product of its digits is 34992, while the sum is 41.

The square root of 64919291 is about 8057.2508338763. The cubic root of 64919291 is about 401.9060921873.

The spelling of 64919291 in words is "sixty-four million, nine hundred nineteen thousand, two hundred ninety-one".