685101089 has 4 divisors (see below), whose sum is σ = 685165824. Its totient is φ = 685036356.

The previous prime is 685101083. The next prime is 685101143. The reversal of 685101089 is 980101586.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 685101089 - 2⁴ = 685101073 is a prime.

It is a super-4 number, since 4×685101089⁴ (a number of 36 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685101083) 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, 12377 + ... + 39030.

It is an arithmetic number, because the mean of its divisors is an integer number (171291456).

Almost surely, 2^685101089 is an apocalyptic number.

It is an amenable number.

685101089 is a deficient number, since it is larger than the sum of its proper divisors (64735).

685101089 is a wasteful number, since it uses less digits than its factorization.

685101089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64734.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 685101089 is about 26174.4357914359. The cubic root of 685101089 is about 881.5593431103.

The spelling of 685101089 in words is "six hundred eighty-five million, one hundred one thousand, eighty-nine".