681048999 has 8 divisors (see below), whose sum is σ = 1008961520. Its totient is φ = 454032648.

The previous prime is 681048989. The next prime is 681049001. The reversal of 681048999 is 999840186.

681048999 is a `hidden beast` number, since 68 + 10 + 489 + 99 = 666.

It is not a de Polignac number, because 681048999 - 2⁷ = 681048871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681048989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12611992 + ... + 12612045.

It is an arithmetic number, because the mean of its divisors is an integer number (126120190).

Almost surely, 2^681048999 is an apocalyptic number.

681048999 is a deficient number, since it is larger than the sum of its proper divisors (327912521).

681048999 is a wasteful number, since it uses less digits than its factorization.

681048999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25224046 (or 25224040 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The square root of 681048999 is about 26096.9155073928. The cubic root of 681048999 is about 879.8178854376.

The spelling of 681048999 in words is "six hundred eighty-one million, forty-eight thousand, nine hundred ninety-nine".