681250212 has 18 divisors (see below), whose sum is σ = 1722049238. Its totient is φ = 227083392.

The previous prime is 681250211. The next prime is 681250249. The reversal of 681250212 is 212052186.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 425761956 + 255488256 = 20634^2 + 15984^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (681250211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9461773 + ... + 9461844.

Almost surely, 2^681250212 is an apocalyptic number.

It is an amenable number.

681250212 is an abundant number, since it is smaller than the sum of its proper divisors (1040799026).

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

681250212 is a wasteful number, since it uses less digits than its factorization.

681250212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18923627 (or 18923622 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 681250212 is about 26100.7703334595. The cubic root of 681250212 is about 879.9045230437.

The spelling of 681250212 in words is "six hundred eighty-one million, two hundred fifty thousand, two hundred twelve".