681001924 has 12 divisors (see below), whose sum is σ = 1230197248. Its totient is φ = 329517000.

The previous prime is 681001891. The next prime is 681001931. The reversal of 681001924 is 429100186.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an unprimeable number.

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, 2745852 + ... + 2746099.

Almost surely, 2^681001924 is an apocalyptic number.

It is an amenable number.

681001924 is a deficient number, since it is larger than the sum of its proper divisors (549195324).

681001924 is a wasteful number, since it uses less digits than its factorization.

681001924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5491986 (or 5491984 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 681001924 is about 26096.0135652938. The cubic root of 681001924 is about 879.7976135818.

The spelling of 681001924 in words is "six hundred eighty-one million, one thousand, nine hundred twenty-four".