685343971 has 4 divisors (see below), whose sum is σ = 738062752. Its totient is φ = 632625192.

The previous prime is 685343951. The next prime is 685343977. The reversal of 685343971 is 179343586.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 685343971 - 2⁷ = 685343843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685343977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26359371 + ... + 26359396.

It is an arithmetic number, because the mean of its divisors is an integer number (184515688).

Almost surely, 2^685343971 is an apocalyptic number.

685343971 is a deficient number, since it is larger than the sum of its proper divisors (52718781).

685343971 is a wasteful number, since it uses less digits than its factorization.

685343971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52718780.

The product of its digits is 544320, while the sum is 46.

The square root of 685343971 is about 26179.0750600551. The cubic root of 685343971 is about 881.6635075916.

The spelling of 685343971 in words is "six hundred eighty-five million, three hundred forty-three thousand, nine hundred seventy-one".