684921241 has 3 divisors (see below), whose sum is σ = 684947413. Its totient is φ = 684895070.

The previous prime is 684921227. The next prime is 684921257. The reversal of 684921241 is 142129486.

The square root of 684921241 is 26171.

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.

It is a de Polignac number, because none of the positive numbers 2^k-684921241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 684921241.

It is not an unprimeable number, because it can be changed into a prime (684921221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 13086 + ... + 39256.

Almost surely, 2^684921241 is an apocalyptic number.

684921241 is the 26171-st square number.

684921241 is the 13086-th centered octagonal number.

It is an amenable number.

684921241 is a deficient number, since it is larger than the sum of its proper divisors (26172).

684921241 is an frugal number, since it uses more digits than its factorization.

684921241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52342 (or 26171 counting only the distinct ones).

The product of its digits is 27648, while the sum is 37.

The cubic root of 684921241 is about 881.4821960718.

The spelling of 684921241 in words is "six hundred eighty-four million, nine hundred twenty-one thousand, two hundred forty-one".