64645131 has 8 divisors (see below), whose sum is σ = 87232320. Its totient is φ = 42577352.

The previous prime is 64645129. The next prime is 64645171. The reversal of 64645131 is 13154646.

64645131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 64645131 - 2¹ = 64645129 is a prime.

It is a super-2 number, since 2×64645131² = 8357985924014322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64645121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129561 + ... + 130058.

It is an arithmetic number, because the mean of its divisors is an integer number (10904040).

Almost surely, 2^64645131 is an apocalyptic number.

64645131 is a deficient number, since it is larger than the sum of its proper divisors (22587189).

64645131 is a wasteful number, since it uses less digits than its factorization.

64645131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259705.

The product of its digits is 8640, while the sum is 30.

The square root of 64645131 is about 8040.2195865536. The cubic root of 64645131 is about 401.3395320440.

Adding to 64645131 its reverse (13154646), we get a palindrome (77799777).

The spelling of 64645131 in words is "sixty-four million, six hundred forty-five thousand, one hundred thirty-one".