343553521 has 4 divisors (see below), whose sum is σ = 343788544. Its totient is φ = 343318500.

The previous prime is 343553479. The next prime is 343553537. The reversal of 343553521 is 125355343.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 343553521 - 2¹⁷ = 343422449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (343553591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115305 + ... + 118246.

It is an arithmetic number, because the mean of its divisors is an integer number (85947136).

Almost surely, 2^343553521 is an apocalyptic number.

It is an amenable number.

343553521 is a deficient number, since it is larger than the sum of its proper divisors (235023).

343553521 is a wasteful number, since it uses less digits than its factorization.

343553521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235022.

The product of its digits is 27000, while the sum is 31.

The square root of 343553521 is about 18535.1968157881. The cubic root of 343553521 is about 700.3763425278.

The spelling of 343553521 in words is "three hundred forty-three million, five hundred fifty-three thousand, five hundred twenty-one".