681819141 has 4 divisors (see below), whose sum is σ = 909092192. Its totient is φ = 454546092.

The previous prime is 681819139. The next prime is 681819169. The reversal of 681819141 is 141918186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 681819141 - 2¹ = 681819139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 681819141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681819101) 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 3 ways as a sum of consecutive naturals, for example, 113636521 + ... + 113636526.

It is an arithmetic number, because the mean of its divisors is an integer number (227273048).

Almost surely, 2^681819141 is an apocalyptic number.

It is an amenable number.

681819141 is a deficient number, since it is larger than the sum of its proper divisors (227273051).

681819141 is a wasteful number, since it uses less digits than its factorization.

681819141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227273050.

The product of its digits is 13824, while the sum is 39.

The square root of 681819141 is about 26111.6667602817. Note that the first 3 decimals coincide. The cubic root of 681819141 is about 880.1493982749.

The spelling of 681819141 in words is "six hundred eighty-one million, eight hundred nineteen thousand, one hundred forty-one".