354391321 has 2 divisors, whose sum is σ = 354391322. Its totient is φ = 354391320.

The previous prime is 354391319. The next prime is 354391381. The reversal of 354391321 is 123193453.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 341510400 + 12880921 = 18480^2 + 3589^2 .

It is an emirp because it is prime and its reverse (123193453) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 354391321 - 2¹ = 354391319 is a prime.

Together with 354391319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (354391381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177195660 + 177195661.

It is an arithmetic number, because the mean of its divisors is an integer number (177195661).

Almost surely, 2^354391321 is an apocalyptic number.

It is an amenable number.

354391321 is a deficient number, since it is larger than the sum of its proper divisors (1).

354391321 is an equidigital number, since it uses as much as digits as its factorization.

354391321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 31.

The square root of 354391321 is about 18825.2840881619. The cubic root of 354391321 is about 707.6649607232.

It can be divided in two parts, 3543 and 91321, that added together give a square (94864 = 308²).

The spelling of 354391321 in words is "three hundred fifty-four million, three hundred ninety-one thousand, three hundred twenty-one".