681254523 has 8 divisors (see below), whose sum is σ = 1009266000. Its totient is φ = 454169664.

The previous prime is 681254501. The next prime is 681254537. The reversal of 681254523 is 325452186.

681254523 is a `hidden beast` number, since 6 + 8 + 125 + 4 + 523 = 666.

It is not a de Polignac number, because 681254523 - 2⁵ = 681254491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681254023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12615798 + ... + 12615851.

It is an arithmetic number, because the mean of its divisors is an integer number (126158250).

Almost surely, 2^681254523 is an apocalyptic number.

681254523 is a deficient number, since it is larger than the sum of its proper divisors (328011477).

681254523 is a wasteful number, since it uses less digits than its factorization.

681254523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25231658 (or 25231652 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 681254523 is about 26100.8529170983. The cubic root of 681254523 is about 879.9063790726.

The spelling of 681254523 in words is "six hundred eighty-one million, two hundred fifty-four thousand, five hundred twenty-three".