684947413 has 2 divisors, whose sum is σ = 684947414. Its totient is φ = 684947412.

The previous prime is 684947411. The next prime is 684947443. The reversal of 684947413 is 314749486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 426959569 + 257987844 = 20663^2 + 16062^2 .

It is a cyclic number.

It is not a de Polignac number, because 684947413 - 2¹ = 684947411 is a prime.

Together with 684947411, it forms a pair of twin primes.

It is the 26172-nd Hogben number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684947411) by changing a digit.

It is a nontrivial repunit in base 26171.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342473706 + 342473707.

It is an arithmetic number, because the mean of its divisors is an integer number (342473707).

Almost surely, 2^684947413 is an apocalyptic number.

It is an amenable number.

684947413 is a deficient number, since it is larger than the sum of its proper divisors (1).

684947413 is an equidigital number, since it uses as much as digits as its factorization.

684947413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 46.

The square root of 684947413 is about 26171.5000143286. The cubic root of 684947413 is about 881.4934235711.

The spelling of 684947413 in words is "six hundred eighty-four million, nine hundred forty-seven thousand, four hundred thirteen".