685281923 has 4 divisors (see below), whose sum is σ = 685679088. Its totient is φ = 684884760.

The previous prime is 685281907. The next prime is 685281937. The reversal of 685281923 is 329182586.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 329182586 = 2 ⋅164591293.

It is a cyclic number.

It is not a de Polignac number, because 685281923 - 2⁴ = 685281907 is a prime.

It is a super-2 number, since 2×685281923² = 939222627981155858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685281943) 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, 195983 + ... + 199448.

It is an arithmetic number, because the mean of its divisors is an integer number (171419772).

Almost surely, 2^685281923 is an apocalyptic number.

685281923 is a deficient number, since it is larger than the sum of its proper divisors (397165).

685281923 is a wasteful number, since it uses less digits than its factorization.

685281923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397164.

The product of its digits is 207360, while the sum is 44.

The square root of 685281923 is about 26177.8899646247. The cubic root of 685281923 is about 881.6368994889.

The spelling of 685281923 in words is "six hundred eighty-five million, two hundred eighty-one thousand, nine hundred twenty-three".