464520821 has 2 divisors, whose sum is σ = 464520822. Its totient is φ = 464520820.

The previous prime is 464520817. The next prime is 464520839. The reversal of 464520821 is 128025464.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 412536721 + 51984100 = 20311^2 + 7210^2 .

It is a cyclic number.

It is not a de Polignac number, because 464520821 - 2² = 464520817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (464520841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 232260410 + 232260411.

It is an arithmetic number, because the mean of its divisors is an integer number (232260411).

Almost surely, 2^464520821 is an apocalyptic number.

It is an amenable number.

464520821 is a deficient number, since it is larger than the sum of its proper divisors (1).

464520821 is an equidigital number, since it uses as much as digits as its factorization.

464520821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 464520821 is about 21552.7450919831. The cubic root of 464520821 is about 774.4648798508.

The spelling of 464520821 in words is "four hundred sixty-four million, five hundred twenty thousand, eight hundred twenty-one".