4651021 has 2 divisors, whose sum is σ = 4651022. Its totient is φ = 4651020.

The previous prime is 4651019. The next prime is 4651027. The reversal of 4651021 is 1201564.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4141225 + 509796 = 2035^2 + 714^2 .

It is a cyclic number.

It is not a de Polignac number, because 4651021 - 2¹ = 4651019 is a prime.

Together with 4651019, it forms a pair of twin primes.

4651021 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 4651021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4651027) 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 as a sum of consecutive naturals, namely, 2325510 + 2325511.

It is an arithmetic number, because the mean of its divisors is an integer number (2325511).

Almost surely, 2^4651021 is an apocalyptic number.

It is an amenable number.

4651021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4651021 is an equidigital number, since it uses as much as digits as its factorization.

4651021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 4651021 is about 2156.6225909973. The cubic root of 4651021 is about 166.9229687645.

Adding to 4651021 its reverse (1201564), we get a palindrome (5852585).

The spelling of 4651021 in words is "four million, six hundred fifty-one thousand, twenty-one".