64913191 has 24 divisors (see below), whose sum is σ = 80643600. Its totient is φ = 51916032.

The previous prime is 64913183. The next prime is 64913213. The reversal of 64913191 is 19131946.

It is a happy number.

It is not a de Polignac number, because 64913191 - 2³ = 64913183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64913141) 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 23 ways as a sum of consecutive naturals, for example, 123856 + ... + 124378.

It is an arithmetic number, because the mean of its divisors is an integer number (3360150).

Almost surely, 2^64913191 is an apocalyptic number.

64913191 is a deficient number, since it is larger than the sum of its proper divisors (15730409).

64913191 is a wasteful number, since it uses less digits than its factorization.

64913191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703 (or 696 counting only the distinct ones).

The product of its digits is 5832, while the sum is 34.

The square root of 64913191 is about 8056.8722839573. The cubic root of 64913191 is about 401.8935037157.

The spelling of 64913191 in words is "sixty-four million, nine hundred thirteen thousand, one hundred ninety-one".