681507549 has 24 divisors (see below), whose sum is σ = 1046597760. Its totient is φ = 426377952.

The previous prime is 681507529. The next prime is 681507557. The reversal of 681507549 is 945705186.

It is not a de Polignac number, because 681507549 - 2⁵ = 681507517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681507529) 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 23 ways as a sum of consecutive naturals, for example, 20089 + ... + 42030.

It is an arithmetic number, because the mean of its divisors is an integer number (43608240).

Almost surely, 2^681507549 is an apocalyptic number.

681507549 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

681507549 is a deficient number, since it is larger than the sum of its proper divisors (365090211).

681507549 is a wasteful number, since it uses less digits than its factorization.

681507549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62201 (or 62198 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The square root of 681507549 is about 26105.6995500983. The cubic root of 681507549 is about 880.0153014729.

The spelling of 681507549 in words is "six hundred eighty-one million, five hundred seven thousand, five hundred forty-nine".