343694521 has 3 divisors (see below), whose sum is σ = 343713061. Its totient is φ = 343675982.

The previous prime is 343694473. The next prime is 343694531. The reversal of 343694521 is 125496343.

The square root of 343694521 is 18539.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 125496343 = 7 ⋅17928049.

It is not a de Polignac number, because 343694521 - 2⁹ = 343694009 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (343694531) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 9270 + ... + 27808.

Almost surely, 2^343694521 is an apocalyptic number.

343694521 is the 18539-th square number.

343694521 is the 9270-th centered octagonal number.

It is an amenable number.

343694521 is a deficient number, since it is larger than the sum of its proper divisors (18540).

343694521 is an frugal number, since it uses more digits than its factorization.

343694521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37078 (or 18539 counting only the distinct ones).

The product of its digits is 77760, while the sum is 37.

The cubic root of 343694521 is about 700.4721447356.

The spelling of 343694521 in words is "three hundred forty-three million, six hundred ninety-four thousand, five hundred twenty-one".