681961100 has 36 divisors (see below), whose sum is σ = 1530891600. Its totient is φ = 263376960.

The previous prime is 681961087. The next prime is 681961127. The reversal of 681961100 is 1169186.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114680 + ... + 120479.

Almost surely, 2^681961100 is an apocalyptic number.

It is an amenable number.

681961100 is an abundant number, since it is smaller than the sum of its proper divisors (848930500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

681961100 is a wasteful number, since it uses less digits than its factorization.

681961100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235202 (or 235195 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 681961100 is about 26114.3849247881. The cubic root of 681961100 is about 880.2104782351.

It can be divided in two parts, 68196 and 1100, that added together give a palindrome (69296).

The spelling of 681961100 in words is "six hundred eighty-one million, nine hundred sixty-one thousand, one hundred".