354304721 has 2 divisors, whose sum is σ = 354304722. Its totient is φ = 354304720.

The previous prime is 354304679. The next prime is 354304747. The reversal of 354304721 is 127403453.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 246144721 + 108160000 = 15689^2 + 10400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-354304721 is a prime.

It is not a weakly prime, because it can be changed into another prime (354304771) 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 as a sum of consecutive naturals, namely, 177152360 + 177152361.

It is an arithmetic number, because the mean of its divisors is an integer number (177152361).

Almost surely, 2^354304721 is an apocalyptic number.

It is an amenable number.

354304721 is a deficient number, since it is larger than the sum of its proper divisors (1).

354304721 is an equidigital number, since it uses as much as digits as its factorization.

354304721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 354304721 is about 18822.9838495388. The cubic root of 354304721 is about 707.6073137338.

The spelling of 354304721 in words is "three hundred fifty-four million, three hundred four thousand, seven hundred twenty-one".