64491571 has 8 divisors (see below), whose sum is σ = 65458880. Its totient is φ = 63528192.

The previous prime is 64491569. The next prime is 64491577. The reversal of 64491571 is 17519446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64491571 - 2¹ = 64491569 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64491571.

It is not an unprimeable number, because it can be changed into a prime (64491577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52561 + ... + 53773.

It is an arithmetic number, because the mean of its divisors is an integer number (8182360).

Almost surely, 2^64491571 is an apocalyptic number.

64491571 is a deficient number, since it is larger than the sum of its proper divisors (967309).

64491571 is a wasteful number, since it uses less digits than its factorization.

64491571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1965.

The product of its digits is 30240, while the sum is 37.

The square root of 64491571 is about 8030.6644183405. The cubic root of 64491571 is about 401.0214953973.

The spelling of 64491571 in words is "sixty-four million, four hundred ninety-one thousand, five hundred seventy-one".