354336721 has 2 divisors, whose sum is σ = 354336722. Its totient is φ = 354336720.

The previous prime is 354336701. The next prime is 354336733. The reversal of 354336721 is 127633453.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 297183121 + 57153600 = 17239^2 + 7560^2 .

It is an emirp because it is prime and its reverse (127633453) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 354336721 - 2⁹ = 354336209 is a prime.

It is not a weakly prime, because it can be changed into another prime (354336701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177168360 + 177168361.

It is an arithmetic number, because the mean of its divisors is an integer number (177168361).

Almost surely, 2^354336721 is an apocalyptic number.

It is an amenable number.

354336721 is a deficient number, since it is larger than the sum of its proper divisors (1).

354336721 is an equidigital number, since it uses as much as digits as its factorization.

354336721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 34.

The square root of 354336721 is about 18823.8338549829. The cubic root of 354336721 is about 707.6286162559.

The spelling of 354336721 in words is "three hundred fifty-four million, three hundred thirty-six thousand, seven hundred twenty-one".