409264721 has 2 divisors, whose sum is σ = 409264722. Its totient is φ = 409264720.

The previous prime is 409264717. The next prime is 409264811. The reversal of 409264721 is 127462904.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 330694225 + 78570496 = 18185^2 + 8864^2 .

It is a cyclic number.

It is not a de Polignac number, because 409264721 - 2² = 409264717 is a prime.

It is a super-2 number, since 2×409264721² = 334995223710415682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (409264321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204632360 + 204632361.

It is an arithmetic number, because the mean of its divisors is an integer number (204632361).

Almost surely, 2^409264721 is an apocalyptic number.

It is an amenable number.

409264721 is a deficient number, since it is larger than the sum of its proper divisors (1).

409264721 is an equidigital number, since it uses as much as digits as its factorization.

409264721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 409264721 is about 20230.2921629916. The cubic root of 409264721 is about 742.4515243060.

The spelling of 409264721 in words is "four hundred nine million, two hundred sixty-four thousand, seven hundred twenty-one".