681398211 has 32 divisors (see below), whose sum is σ = 996532992. Its totient is φ = 411626880.

The previous prime is 681398209. The next prime is 681398213. The reversal of 681398211 is 112893186.

It is an interprime number because it is at equal distance from previous prime (681398209) and next prime (681398213).

It is not a de Polignac number, because 681398211 - 2¹ = 681398209 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 681398211.

It is not an unprimeable number, because it can be changed into a prime (681398213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 585316 + ... + 586478.

It is an arithmetic number, because the mean of its divisors is an integer number (31141656).

Almost surely, 2^681398211 is an apocalyptic number.

681398211 is a deficient number, since it is larger than the sum of its proper divisors (315134781).

681398211 is a wasteful number, since it uses less digits than its factorization.

681398211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443.

The product of its digits is 20736, while the sum is 39.

The square root of 681398211 is about 26103.6053257017. The cubic root of 681398211 is about 879.9682370595.

The spelling of 681398211 in words is "six hundred eighty-one million, three hundred ninety-eight thousand, two hundred eleven".