684951241 has 16 divisors (see below), whose sum is σ = 749611408. Its totient is φ = 622080000.

The previous prime is 684951229. The next prime is 684951263. The reversal of 684951241 is 142159486.

It is the 10685-th star number.

It can be written as a sum of positive squares in 8 ways, for example, as 182250000 + 502701241 = 13500^2 + 22421^2 .

It is a 5-Lehmer number, since φ(684951241) divides (684951241-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 684951241 - 2⁹ = 684950729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 684951194 and 684951203.

It is not an unprimeable number, because it can be changed into a prime (684951221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226741 + ... + 229741.

It is an arithmetic number, because the mean of its divisors is an integer number (46850713).

Almost surely, 2^684951241 is an apocalyptic number.

It is an amenable number.

684951241 is a deficient number, since it is larger than the sum of its proper divisors (64660167).

684951241 is a wasteful number, since it uses less digits than its factorization.

684951241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3292.

The product of its digits is 69120, while the sum is 40.

The square root of 684951241 is about 26171.5731472145. The cubic root of 684951241 is about 881.4950657169.

The spelling of 684951241 in words is "six hundred eighty-four million, nine hundred fifty-one thousand, two hundred forty-one".