681394148 has 6 divisors (see below), whose sum is σ = 1192439766. Its totient is φ = 340697072.

The previous prime is 681394069. The next prime is 681394201. The reversal of 681394148 is 841493186.

It can be written as a sum of positive squares in only one way, i.e., 424689664 + 256704484 = 20608^2 + 16022^2 .

It is a junction number, because it is equal to n+sod(n) for n = 681394099 and 681394108.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85174265 + ... + 85174272.

It is an arithmetic number, because the mean of its divisors is an integer number (198739961).

Almost surely, 2^681394148 is an apocalyptic number.

It is an amenable number.

681394148 is a deficient number, since it is larger than the sum of its proper divisors (511045618).

681394148 is a wasteful number, since it uses less digits than its factorization.

681394148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170348541 (or 170348539 counting only the distinct ones).

The product of its digits is 165888, while the sum is 44.

The square root of 681394148 is about 26103.5275010869. The cubic root of 681394148 is about 879.9664880489.

The spelling of 681394148 in words is "six hundred eighty-one million, three hundred ninety-four thousand, one hundred forty-eight".