64521125 has 8 divisors (see below), whose sum is σ = 80522520. Its totient is φ = 51616800.

The previous prime is 64521101. The next prime is 64521139. The reversal of 64521125 is 52112546.

64521125 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 7579009 + 56942116 = 2753^2 + 7546^2 .

It is not a de Polignac number, because 64521125 - 2¹² = 64517029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64521094 and 64521103.

It is a congruent number.

It is an unprimeable number.

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, 257960 + ... + 258209.

It is an arithmetic number, because the mean of its divisors is an integer number (10065315).

Almost surely, 2^64521125 is an apocalyptic number.

It is an amenable number.

64521125 is a deficient number, since it is larger than the sum of its proper divisors (16001395).

64521125 is an equidigital number, since it uses as much as digits as its factorization.

64521125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516184 (or 516174 counting only the distinct ones).

The product of its digits is 2400, while the sum is 26.

The square root of 64521125 is about 8032.5042794884. The cubic root of 64521125 is about 401.0827436046.

It can be divided in two parts, 64521 and 125, that added together give a palindrome (64646).

The spelling of 64521125 in words is "sixty-four million, five hundred twenty-one thousand, one hundred twenty-five".