684991471 has 12 divisors (see below), whose sum is σ = 708711528. Its totient is φ = 662025312.

The previous prime is 684991429. The next prime is 684991481. The reversal of 684991471 is 174199486.

It is not a de Polignac number, because 684991471 - 2⁹ = 684990959 is a prime.

It is a super-3 number, since 3×684991471³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684991481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 213340 + ... + 216526.

It is an arithmetic number, because the mean of its divisors is an integer number (59059294).

Almost surely, 2^684991471 is an apocalyptic number.

684991471 is a deficient number, since it is larger than the sum of its proper divisors (23720057).

684991471 is a wasteful number, since it uses less digits than its factorization.

684991471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3418 (or 3381 counting only the distinct ones).

The product of its digits is 435456, while the sum is 49.

The square root of 684991471 is about 26172.3417179281. The cubic root of 684991471 is about 881.5123233211.

The spelling of 684991471 in words is "six hundred eighty-four million, nine hundred ninety-one thousand, four hundred seventy-one".