354223721 has 2 divisors, whose sum is σ = 354223722. Its totient is φ = 354223720.

The previous prime is 354223717. The next prime is 354223729. The reversal of 354223721 is 127322453.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 329023321 + 25200400 = 18139^2 + 5020^2 .

It is a cyclic number.

It is not a de Polignac number, because 354223721 - 2² = 354223717 is a prime.

It is a super-3 number, since 3×354223721³ (a number of 27 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (354223729) 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, 177111860 + 177111861.

It is an arithmetic number, because the mean of its divisors is an integer number (177111861).

Almost surely, 2^354223721 is an apocalyptic number.

It is an amenable number.

354223721 is a deficient number, since it is larger than the sum of its proper divisors (1).

354223721 is an equidigital number, since it uses as much as digits as its factorization.

354223721 is an odious number, because the sum of its binary digits is odd.

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

The square root of 354223721 is about 18820.8321016899. The cubic root of 354223721 is about 707.5533859918.

The spelling of 354223721 in words is "three hundred fifty-four million, two hundred twenty-three thousand, seven hundred twenty-one".