354240521 has 2 divisors, whose sum is σ = 354240522. Its totient is φ = 354240520.

The previous prime is 354240473. The next prime is 354240529. The reversal of 354240521 is 125042453.

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., 242113600 + 112126921 = 15560^2 + 10589^2 .

It is a cyclic number.

It is not a de Polignac number, because 354240521 - 2¹⁰ = 354239497 is a prime.

It is a super-3 number, since 3×354240521³ (a number of 27 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (354240529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177120260 + 177120261.

It is an arithmetic number, because the mean of its divisors is an integer number (177120261).

Almost surely, 2^354240521 is an apocalyptic number.

It is an amenable number.

354240521 is a deficient number, since it is larger than the sum of its proper divisors (1).

354240521 is an equidigital number, since it uses as much as digits as its factorization.

354240521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 354240521 is about 18821.2784103525. The cubic root of 354240521 is about 707.5645716806.

Adding to 354240521 its reverse (125042453), we get a palindrome (479282974).

The spelling of 354240521 in words is "three hundred fifty-four million, two hundred forty thousand, five hundred twenty-one".