685490961 has 8 divisors (see below), whose sum is σ = 916928064. Its totient is φ = 455523920.

The previous prime is 685490929. The next prime is 685490963. The reversal of 685490961 is 169094586.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 685490961 - 2⁵ = 685490929 is a prime.

It is a super-2 number, since 2×685490961² = 939795715225407042, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 685490961.

It is not an unprimeable number, because it can be changed into a prime (685490963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 366426 + ... + 368291.

It is an arithmetic number, because the mean of its divisors is an integer number (114616008).

Almost surely, 2^685490961 is an apocalyptic number.

It is an amenable number.

685490961 is a deficient number, since it is larger than the sum of its proper divisors (231437103).

685490961 is a wasteful number, since it uses less digits than its factorization.

685490961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735031.

The product of its (nonzero) digits is 466560, while the sum is 48.

The square root of 685490961 is about 26181.8823043722. The cubic root of 685490961 is about 881.7265350447.

The spelling of 685490961 in words is "six hundred eighty-five million, four hundred ninety thousand, nine hundred sixty-one".