46509821 has 2 divisors, whose sum is σ = 46509822. Its totient is φ = 46509820.

The previous prime is 46509811. The next prime is 46509857. The reversal of 46509821 is 12890564.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39513796 + 6996025 = 6286^2 + 2645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-46509821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (46509811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23254910 + 23254911.

It is an arithmetic number, because the mean of its divisors is an integer number (23254911).

Almost surely, 2^46509821 is an apocalyptic number.

It is an amenable number.

46509821 is a deficient number, since it is larger than the sum of its proper divisors (1).

46509821 is an equidigital number, since it uses as much as digits as its factorization.

46509821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 46509821 is about 6819.8109211326. The cubic root of 46509821 is about 359.6236318624.

The spelling of 46509821 in words is "forty-six million, five hundred nine thousand, eight hundred twenty-one".