681210225 has 36 divisors (see below), whose sum is σ = 1221530076. Its totient is φ = 362893440.

The previous prime is 681210223. The next prime is 681210259. The reversal of 681210225 is 522012186.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 156816 + 681053409 = 396^2 + 26097^2 .

It is not a de Polignac number, because 681210225 - 2¹ = 681210223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681210221) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 361987 + ... + 363863.

It is an arithmetic number, because the mean of its divisors is an integer number (33931391).

Almost surely, 2^681210225 is an apocalyptic number.

It is an amenable number.

681210225 is a deficient number, since it is larger than the sum of its proper divisors (540319851).

681210225 is a wasteful number, since it uses less digits than its factorization.

681210225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3506 (or 3498 counting only the distinct ones).

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

The square root of 681210225 is about 26100.0043103445. The cubic root of 681210225 is about 879.8873069362.

The spelling of 681210225 in words is "six hundred eighty-one million, two hundred ten thousand, two hundred twenty-five".