681749433 has 8 divisors (see below), whose sum is σ = 1009999200. Its totient is φ = 454499604.

The previous prime is 681749423. The next prime is 681749449. The reversal of 681749433 is 334947186.

681749433 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 681749433 - 2¹⁰ = 681748409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681749413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12624963 + ... + 12625016.

It is an arithmetic number, because the mean of its divisors is an integer number (126249900).

Almost surely, 2^681749433 is an apocalyptic number.

It is an amenable number.

681749433 is a deficient number, since it is larger than the sum of its proper divisors (328249767).

681749433 is a wasteful number, since it uses less digits than its factorization.

681749433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25249988 (or 25249982 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 681749433 is about 26110.3319205253. The cubic root of 681749433 is about 880.1194022728.

The spelling of 681749433 in words is "six hundred eighty-one million, seven hundred forty-nine thousand, four hundred thirty-three".