681137412 has 12 divisors (see below), whose sum is σ = 1589320656. Its totient is φ = 227045800.

The previous prime is 681137339. The next prime is 681137437. The reversal of 681137412 is 214731186.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28380714 + ... + 28380737.

It is an arithmetic number, because the mean of its divisors is an integer number (132443388).

Almost surely, 2^681137412 is an apocalyptic number.

It is an amenable number.

681137412 is an abundant number, since it is smaller than the sum of its proper divisors (908183244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

681137412 is a wasteful number, since it uses less digits than its factorization.

681137412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56761458 (or 56761456 counting only the distinct ones).

The product of its digits is 8064, while the sum is 33.

The square root of 681137412 is about 26098.6093882414. The cubic root of 681137412 is about 879.8559561065.

Adding to 681137412 its reverse (214731186), we get a palindrome (895868598).

The spelling of 681137412 in words is "six hundred eighty-one million, one hundred thirty-seven thousand, four hundred twelve".