681437427 has 16 divisors (see below), whose sum is σ = 996727680. Its totient is φ = 410681600.

The previous prime is 681437417. The next prime is 681437431. The reversal of 681437427 is 724734186.

It is a cyclic number.

It is not a de Polignac number, because 681437427 - 2¹² = 681433331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681437417) 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 15 ways as a sum of consecutive naturals, for example, 51774 + ... + 63587.

It is an arithmetic number, because the mean of its divisors is an integer number (62295480).

Almost surely, 2^681437427 is an apocalyptic number.

681437427 is a deficient number, since it is larger than the sum of its proper divisors (315290253).

681437427 is a wasteful number, since it uses less digits than its factorization.

681437427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115554.

The product of its digits is 225792, while the sum is 42.

The square root of 681437427 is about 26104.3564755004. The cubic root of 681437427 is about 879.9851181195.

The spelling of 681437427 in words is "six hundred eighty-one million, four hundred thirty-seven thousand, four hundred twenty-seven".