64189081 has 4 divisors (see below), whose sum is σ = 70024464. Its totient is φ = 58353700.

The previous prime is 64189079. The next prime is 64189133. The reversal of 64189081 is 18098146.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 64189081 - 2¹ = 64189079 is a prime.

It is a super-2 number, since 2×64189081² = 8240476239249122, which contains 22 as substring.

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 64189081.

It is not an unprimeable number, because it can be changed into a prime (64189031) 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, 2917675 + ... + 2917696.

It is an arithmetic number, because the mean of its divisors is an integer number (17506116).

Almost surely, 2^64189081 is an apocalyptic number.

It is an amenable number.

64189081 is a deficient number, since it is larger than the sum of its proper divisors (5835383).

64189081 is a wasteful number, since it uses less digits than its factorization.

64189081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5835382.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 64189081 is about 8011.8088469459. The cubic root of 64189081 is about 400.3935314555.

The spelling of 64189081 in words is "sixty-four million, one hundred eighty-nine thousand, eighty-one".