681509487 has 24 divisors (see below), whose sum is σ = 949006128. Its totient is φ = 434972160.

The previous prime is 681509467. The next prime is 681509489. The reversal of 681509487 is 784905186.

681509487 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 681509487 - 2¹⁶ = 681443951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681509489) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 278433 + ... + 280869.

It is an arithmetic number, because the mean of its divisors is an integer number (39541922).

Almost surely, 2^681509487 is an apocalyptic number.

681509487 is a deficient number, since it is larger than the sum of its proper divisors (267496641).

681509487 is a wasteful number, since it uses less digits than its factorization.

681509487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2599 (or 2568 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 48.

The square root of 681509487 is about 26105.7366684030. The cubic root of 681509487 is about 880.0161356373.

The spelling of 681509487 in words is "six hundred eighty-one million, five hundred nine thousand, four hundred eighty-seven".