52021645 has 8 divisors (see below), whose sum is σ = 67228056. Its totient is φ = 38415936.

The previous prime is 52021643. The next prime is 52021687. The reversal of 52021645 is 54612025.

52021645 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 3175524 + 48846121 = 1782^2 + 6989^2 .

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

It is not a de Polignac number, because 52021645 - 2¹ = 52021643 is a prime.

It is a super-3 number, since 3×52021645³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52021643) 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, 400102 + ... + 400231.

It is an arithmetic number, because the mean of its divisors is an integer number (8403507).

Almost surely, 2^52021645 is an apocalyptic number.

It is an amenable number.

52021645 is a deficient number, since it is larger than the sum of its proper divisors (15206411).

52021645 is a wasteful number, since it uses less digits than its factorization.

52021645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800351.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 52021645 is about 7212.6032055008. The cubic root of 52021645 is about 373.3028970900.

The spelling of 52021645 in words is "fifty-two million, twenty-one thousand, six hundred forty-five".